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.
My personal favourite (along with sister bar Original Sin), this intimate speakeasy is perfect whatever the occasion – from a cosy date night, to a thoughtful solo cocktail.
If you're in the area, pay a visit to the Discount Suit Company too, which focuses on forgotten classic recipes.
3. Berry and Rye, Liverpool
This atmospheric boozer plays the blues and slings a mean drink. Walk through the big black doors at the front, and go for an Old Fashioned.
4. Milk Thistle, Bristol
The younger sibling of cult Bristol bar Hyde and Co, Milk Thistle offers hours of cocktail fun. Press the doorbell of an elegant townhouse, and cross your fingers that they let you in. (You could also just book a table.)
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.
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.
7. Dusk Til Pawn, Manchester
This Northern Quarter speakeasy hides behind a pawn shopfront, but is actually set in a Grade II listed building, meaning it's got lovely high ceilings. There's also a free-to-use jukebox, and inventive cocktails.
8. Ladies and Gents, London
Located in a former public toilet, this Kentish Town bar makes cocktails from a "menu of homemade liqueurs and syrups, botanicals and herbs". Oh, and they make their own gin. AND they run a gin club where you can make your own.
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.
12. Basement Sate, London
A cocktail bar + a dessert bar = all your drunken dreams come true. They do smaller savoury bites too, if pudding's not your thing. And seeing as you're in the area, why not stop by Cahoots for a nightcap?
13. Flat 0/1, Glasgow
This beloved hidden dive bar is styled like a student flat, including sofas and a bed. The cocktails aren't classy, but when you can get a pint of Frosty Jack's behind the bar and a house party vibe after hours, it's pretty hard to resist.
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.
15. The Dead Canary, Cardiff
Cardiff's newest bar makes a splash with imaginative cocktails – for example, the Delia Smith (Welsh lamb-infused whisky, redcurrant, raspberry and mint). Also, the decor is "influenced by Welsh industrial heritage" if that floats your boat.