1. Boilermaker, Nottingham
An unassuming entrance (above left, I mean look at it) in what looks like an electrics shop might not fill you with glee. But get through the door that says "Staff Only" and you're in for a treat.
5. Panda and Sons, Edinburgh
This stylish Scottish speakeasy is a treasure. The front of the bar looks like a barbershop, and you'll have to find the hidden bookshelf to gain entry. The cocktails make the caper worth it though.
6. Covent Garden Cocktail Club, London
An oldie but a goodie, this reliable basement bar do a great happy hour (on Mondays it runs all night on all cocktails!). Including the butterbeer cocktail above.
9. The Maven, Leeds
This prohibition-influenced bar isn't easy to find (“follow the hidden staircase to the doors emblazoned ‘M’”) but it's a worthy quest. And if your fave tipple isn't on the menu, they'll make for you especially.
10. Red Light, Bristol
Billing itself as an "adult drinking den", Red Light offers cocktails mixed by bartenders in braces, and a louche 1950s air. To get in you'll need to search for a flashing red light, and then place a call from the payphone next to it. Hey presto, the doors open. To further entice you, they've just launched a brand new cocktail menu.
11. No28, Newcastle
This well-loved bar is hidden above Granger Market (opposite the Café Royal). It's got a late license, does great food, and there's even a Dalek for photo ops.
14. The Lost and Found, Birmingham
This “Victorian botanical hideaway” has a secret behind its bookcase. You’ll need to ask the staff for a key, but the end result is worth it. Sip on a Midlands Princess – a twist on an Aperol Spritz with passionfruit syrup and vanilla sugar.