Heh, whatever the British tourist board people are paying Peaky Blinders, it's not enough!
Margate was a creation of mass railway travel in the mid-19th century, and lost its reason to exist with mass air travel in the 1960s, and hasn't had much money come into it since then, like a rust-belt town. So there's a lot of faded-grandeur to it - but in its day I guess it was London's answer to Coney Island, it had the UK's first rollercoaster etc. But now it's near the main immigration route and has lots of unused cheap accommodation, which means like similar towns it's become a bit of a dumping ground for immigrants and the drugs/petty crime that come in their wake - think some of the towns along the Rio Grande. But there's been some attempts to develop it as a weekend escape from the city, leading the regeneration with things like the art gallery in the same way that the Tate did for Cornwall, and improving rail links. It's worked a bit, but nothing like Cornwall, and it won't until they stop using it as an immigration dumping ground.
But yeah, rust-belt-Coney-Island-on-the-Rio-Grande gives you some idea of what Margate is like. Despite that, it does have a certain charm.