....or as it's formally known - Longsight Police station.
This is round the back of the building through the railings of the car park compound. Streetview shows a second pile that used to be there as well.
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Presumably these are all confiscated bikes of some sort of another. Most of them have yellow labels tied to the handlebars. Probably illustrates why its best to take extra care of your bike in Longsight, or it might end up in in this compound via the exploits of someone else ;-)