I am probably the only one who would want this but here goes...
An open world game set in the late 70's to early 80's in Britain. Similar to GTA in that it would be satirical and humorous, but more like Sleeping Dogs or The Warriors in terms of game play. You start off as a young guy just out of a borstal or kids home looking to find ways to have fun and make money...
Story threads would include rioting football crews, the punk movement and skinhead gangs, the threat of the IRA, miners fighting the government, yardie gangs and organised crime similar to the Krays. Not many guns but a lot of environment based combat using bricks, bottles and whatever else you can find, knives, chains etc... with the odd shotgun and pipe bomb thrown in for good measure.
Will you end up a football hooligan, police nark or a terrorist for the IRA??