You're bang on about a police cell and a jail cell, very different.
Worst or best one I had, I was 17 at the time and was bringing some pills up to a mate in Watford from Ladbroke Grove, Me and a mate musta popped 6each on the way, obviously being spun meant we was ****ing about on the tubes and that, anyways we get nicked the second we leave Watford Station as the transport police had been watching us most of the way, I get put in the back of a police car straight away as they question my mate about 20yrds away, I'm tripping balls making quite a it of noise in the car when one of the coppers comes back tells me to wind my neck in or hell cuff me to the seat so I chill and he goes back to my mate, it was then I rembered I had 24 more pills in my pocket. (bare in mind them days I was taking 4/6 just to come up so although it's sounds a lot (and it was) my tolerance kept me alive
Obviously I had to take them there and then in the back of the cop car with no water chewing 24 tabs
By the time I was in a cell I was tripping balls seeing and hearing things.
Twas funny as **** tbh, especially as I didn't die or anything.
They also sent me home in one of those white suits things as they'd taken my clothes for evidence (I think they just didn't like me much after keeping them busy all night