As I walked up to Hampden Park for Sunday's Old Firm game, I wondered if Mark Warburton ever thought there would be a scarf with his name emblazoned across it for sale outside a football ground.

I know for certain he would be bewildered to find that Mark Warburton scarf next to a William of Orange scarf at the same market stall.

Inside the ground the atmosphere was electric; I was dismayed to see some terrible banners held up by both sets of fans at either end of the ground just before kick-off. Words like 'paedophiles' and 'hun scum' don't belong in football grounds.

Mark Warburton is doing a special job at Rangers and the club have already been promoted to the top flight

At Hampden Park on Sunday, there were Mark Warburton flags for sale (left); the presence of terrible banners (right) from both Rangers and Celtic fans was disappointing to see, though

The songs sung by the crowd were predominantly sectarian; it's an issue that will re-emerge massively with the return of regular clashes between Celtic and Rangers – will the authorities ever get on top of it? More needs to be done.

But I'm not interested in religion, and not interested one bit in bigotry.

I am interested in football, and what followed was a wonderful game – with Rangers playing some super stuff.

Warburton has something special going on at Ibrox. They play out from the back, he trusts his players to pass the ball and it's so easy on the eye.

Don't underestimate the potential value to the national team of what Warburton's doing: he is coaching several Scottish players, and giving them confidence on the ball, and the ability to pass and receive the ball. It won't be long before the national team benefits from that.

Rangers' squad celebrate wildly after overcoming their Old Firm rivals on penalties in the Scottish Cup semis

Rangers' Kenny Miller celebrates opening the scoring at Hampden Park as it finished 2-2 after extra time

In stark contrast, the lack of progress made by Gary Mackay-Steven since he arrived at Celtic over a year ago is massively disappointing. He was utterly dreadful on Sunday in a game that totally passed him by. Rangers' quality football will transform the Scottish Premiership – other clubs will follow suit, and that can only be a good thing.

Warburton's aim is take Rangers back into the Champions League. If he does that, and Rangers show up well in Europe's top competition, don't rule out Warburton's name being linked with the England job in the future. His teams play wonderful football. On top of that he is a diplomat who has handled the Old Firm rivalry with class and ease, and he is brilliant with the media. He ticks so many boxes with the Football Association.

What I really liked on Sunday was the fact that he told his winger Barrie McKay to stay on the wing. This 21-year-old hugged the touchline, and he tormented Celtic.

Gary Mackay-Steven's distinct lack of progress since arriving at Celtic is massively disappointing

Barrie McKay was man-of-the-match in Sunday's Old Firm clash; he deserves 10 out of 10 for his display

A year ago I gave Jamie Vardy 10 out of 10 for his performance as bottom of the table Leicester won at West Brom. And I'm giving McKay 10 out of 10 for his display on Sunday. Even without his breathtaking wondergoal the 21-year-old was the absolute star of the show.

Great game, great drama, and a brilliant show from Rangers, with the victory to back it up.

There can't be anyone but the most hard-boiled Celtic fans left who thinks Rangers haven't brought something absolutely massive back to Scottish football with their return to the top flight. They'll bring some football quality for a start. But they'll bring so much more.

A sub 20,000 crowd turned up at Saturday's semi between Dundee United and Hibs, and probably even fewer watched it on TV globally.

Neil Lennon, watching the game as a television pundit, admits Rangers' return is good for Scottish football

Even if you dislike Rangers, you should be relieved and grateful they are back in the Scottish Premiership

On Sunday, over 50,000 were inside the same stadium for the Old Firm game, and an estimated 100,000,000 watched around the world.

Passion has returned north of the border.

It's obvious Scottish football was desperate to get Rangers back in the big time. But it had to be a good Rangers, one capable of being competitive. In a short space of time, Mark Warburton has delivered on that – he's the Englishman coming to the rescue of Scottish football. Sunday was just the beginning.

Fair play to the likes of former Celtic captain and manager Neil Lennon, showing himself to be a class act for speaking positively about the return of the Old Firm game.