There are all sorts of reenactment societies in the UK.
From specific battles, such as the Battle of Towton Moor(google it), sieges of castles, through to recreating entire campaigns - mainly civil war Sealed Knot Society, and also recreating Napoleonic civil defence in the Southern Ports Forts.
We have Romans, Normans conquest, English Civil War, War of the Roses(another of our civil wars) all the way through to military reenactments such as the Battle at Rourkes Drift(which I took part in during an anniversary of the Welsh Guards in Cardiff)
http://www.ely.org.uk/react.html
http://c8.com/anathematician/lrrs.htm
http://www.lhiw.org.uk/index.htm
http://www.livinghistory.co.uk/links/society.htm
Basically in the UK if you want to dress up in silly clothes, dresses etc you can pick your period in history, pretend you’re Scottish, or Regency Eglish fops, and no one will ever know that you’re gay.