Suppose you are not British. Suppose you are nonetheless very fond of Britain because of family ties, a British spouse or partner, for example, or a strong cultural interest in the country. Suppose you also speak English reasonably well; you might've spent years living and working in Britain. All of this would allow you to take great pleasure in British culture. You enjoy, and are immersed in, a whole world into which you were not born but nevertheless play a significant part.

That is the experience of so many EU citizens in post-Brexit Britain, and the perspective that I am writing from myself. Britain is my spiritual home, even though I didn't know I was looking for it in the first place; we just met, so to speak.

I’ve never needed a UK passport for to allow this relationship between country and immigrant to develop and flourish. Being an EU citizen was just about enough for me.

How Brexit affected Britain's favourite foods from Weetabix to Marmite Show all 8 1 /8 How Brexit affected Britain's favourite foods from Weetabix to Marmite How Brexit affected Britain's favourite foods from Weetabix to Marmite Weetabix Chief executive of Weetabix Giles Turrell has warned that the price of one of the nation’s favourite breakfast are likely to go up this year by low-single digits in percentage terms. Reuters How Brexit affected Britain's favourite foods from Weetabix to Marmite Nescafé The cost of a 100g jar of Nescafé Original at Sainsbury’s has gone up 40p from £2.75 to £3.15 – a 14 per cent rise—since the Brexit vote. PA How Brexit affected Britain's favourite foods from Weetabix to Marmite Freddo When contacted by The Independent this month, a Mondelez spokesperson declined to discuss specific brands but confirmed that there would be "selective" price increases across its range despite the American multi-national confectionery giant reporting profits of $548m (£450m) in its last three-month financial period. Mondelez, which bought Cadbury in 2010, said rising commodity costs combined with the slump in the value of the pound had made its products more expensive to make. Cadbury How Brexit affected Britain's favourite foods from Weetabix to Marmite Mr Kipling cakes Premier Foods, the maker of Mr Kipling and Bisto gravy, said that it was considering price rises on a case-by-case basis Reuters How Brexit affected Britain's favourite foods from Weetabix to Marmite Walkers Crisps Walkers, owned by US giant PepsiCo, said "the weakened value of the pound" is affecting the import cost of some of its materials. A Walkers spokesman told the Press Association that a 32g standard bag was set to increase from 50p to 55p, and the larger grab bag from 75p to 80p. Getty How Brexit affected Britain's favourite foods from Weetabix to Marmite Marmite Tesco removed Marmite and other Unilever household brand from its website last October, after the manufacturer tried to raise its prices by about 10 per cent owing to sterling’s slump. Tesco and Unilever resolved their argument, but the price of Marmite has increased in UK supermarkets with the grocer reporting a 250g jar of Marmite will now cost Morrisons’ customers £2.64 - an increase of 12.5 per cent. Rex How Brexit affected Britain's favourite foods from Weetabix to Marmite Toblerone Toblerone came under fire in November after it increased the space between the distinctive triangles of its bars. Mondelez International, the company which makes the product, said the change was made due to price rises in recent months. Pixabay How Brexit affected Britain's favourite foods from Weetabix to Marmite Maltesers Maltesers, billed as the “lighter way to enjoy chocolate”, have also shrunk in size. Mars, which owns the brand, has reduced its pouch weight by 15 per cent. Mars said rising costs mean it had to make the unenviable decision between increasing its prices or reducing the weight of its Malteser packs. iStockphoto

So my fears about the impact of Brexit bear no hallmarks of schadenfreude whatsoever. Nevertheless, witnessing the political and social transition that my adoptive country is going through towards the issuing Article 50 and eventually leaving the EU, has only solidified my views about why it is such a significant mistake for all Britons, not just those who have chosen to make Britain their home.

I believe Britons will come to regret choosing to exit the EU – and here are the three reasons why.

What does Brexit mean for Travel?

The UK’s relationship with the US is no replacement for its membership of the EU

In the special relationship with the US, Britain is only a junior partner. If you disagree with the US – and it will happen in such a chaotic political environment – then to whom do you turn to for support? The EU?

As former prime minister John Major recently pointed out: “If we disagree with American policy, we may weaken our ties. But if we support it slavishly, we become seen as an American echo –an invidious role for a nation that has broken free from Europe to become more independent.”

It’s not just Donald Trump's constant contradictions that have set alarm bells ringing, there are also wider geopolitical issues to handle. How do you deal with Russia in the modern world? And China?

Everyone's got a different strategy in mind. Blocs are being taken down, meaning that Moscow and Beijing will have more freedom to act as they choose. This would be fine in a conflict-free world, but common strategies need careful planning. Brexit is throwing that commonality across Europe into question. The consequences could be harmful for everyone in Europe, including all its major and minor nations.

Who’s leading who?

Second, if Britain is eagerly looking for a leading role anywhere in the world, then the best place for that is Europe – the continent it belongs to. Coming out of that continental political bond just as Europe is becoming a byword for the EU and its values is not a sensible move.

In fact, it demonstrates that Brexit is all about a domestic power struggle and nothing to do with the designing of a new, methodical global strategy. The Conservative party has successfully deprived Ukip of any authority in Britain. But that’s all it has achieved.

It's now very difficult to talk about Brexit and its international implications without slipping straight back into national politics.

The empire strikes back

Finally, having touched on the world's major players, I mustn't forget to mention Britain's oldest friends. The concept of a “global Britain” after Brexit is being looked at very sceptically within the Commonwealth.

It's been widely reported that India and other former colonies fear that Britain and its voters may be indulging in empire nostalgia, which is not going to boost Britain's new image; quite the opposite, some would say. Britain is being seen from the outside as having an inflated ego about its own economic power – and that only serves to reinforce old prejudices about Britain and the British. This heady mix of weakness on the world stage and arrogance at home is hardly inspiring. “Britain needs India more than India needs Britain,” this newspaper recently concluded. And with good reason.