I have a very narrow window when I’m keen to test deep conditioners on my hair. In winter, spring and autumn, it responds to rich conditioner like a weeping willow does to a biblical downpour. But in summer, when it gets drier and straw-like, it soaks up the right product gratefully while managing to keep some bounce.

My conditioning mask of choice has mostly been Philip Kingsley’s Elasticizer (£18, 75ml; various, delicious-smelling “flavours”), and I still think it’s excellent some 20 years after first using it (it’s been around for ever – it was formulated by the late trichologist for Audrey Hepburn). Its suggested application – coat the hair, leave for 20 minutes or overnight, then shampoo off – means that my fine hair still feels clean, not waxy, post-treatment, but it also works wonderfully on thick and coarse hair (who may prefer the “Extreme” formula at the same price).

A newer discovery, and frankly a revelation, too, is Dizziak (£22, 200ml). This deep conditioner was formulated by the beauty expert Loretta De Feo, who was frustrated by the ineffectiveness of most conditioners on her afro-textured hair. The result is a mineral oil-, silicone-, cruelty- and sulphate-free concoction that, despite sounding exactly like a product that would make my stubbornly Celtic mop droop despairingly, makes it feel like silk (if you have similar hair, use a pea-sized amount: a little goes an extraordinarily long way). I’ve passed it on to one thick-haired redhead, a coarse and curly-haired biracial friend and a curly-haired woman of Pakistani descent, and all declare themselves unequivocal converts, too. Dizziak can also be used as an all-day moisturising mask on holiday – it doesn’t make hair look greasy – showering out before dinner for a clean, soft texture that still does as it’s told.

If the price of that is too rich for your blood – and I hear you (small indie brands making products in small batches struggle to do things cheaply) – then my preferred high-street deep conditioners are those by Shea Moisture, a brand I always stocked up on when in the US and now available here. Its Jamaican Black Castor Oil Treatment (£12.99, 340g) masque is fantastic on thick, curly, coarser types, while its Superfruit Masque (£10.99, 340g) works great on fine hair, waves and curls, and smells better than most desserts.