Whilst in London recently I remembered to make my first visit to Peckham Rye in Newburgh Street, just off Carnaby Street. I was looking for a tie and scarf for the Goodwood Revival, and Peckham Rye have 200 years of tailoring history and manufacturing in England.
If you're ever in the area, then I definitely recommend paying a visit to Peckham Rye. It's not a big shop, but it's packed with a great selection of accessories and tailoring, all made in England, even including the cloth (apart, apparently from a spotted knitted tie, whose fabric is made in Italy only because to British mill can deal with that particular pattern.
I ended-up buying a tie and scarf in maroon (see pictures below) and the quality is great - these aren't cheaply manufactured items, and they're all the better for that. Here's some photos of the tie and scarf that I bought: