All the suits in JS I've seen recently have been darted, unless I'm wrong? If you're really lucky they may have something vintage, but it probably won't be cheap. I know Paul was getting some Olive J Press suits in, in the future? John did once try to sell me a three piece suit, that if it hadn't been pinstriped I might of gone with?

Hardy and Johnson have got some vintage listed on fleabay and fakebook and can also give you solid advice on fit, where you need to get it altered.

Was gonna say H&J is probably your best bet, or head over to the Vintage Showrooms in Covent Garden, you'll pay premium there though if they have anything. Also, if you can get east try some of the vintage stores at the bagel end of Brick Lane and Cheshire St.

If time permits, your best friend is the internet - though I keep thinking I might try head down Cenci (TC knows this shop from days of it being in Covent Garden) as I think they might have a few items in but they don't show much online if anything.

thank you for the recommendations and comments. a grand's out of my price range so it'll have to be vintage. does anyone have contact details (email or phone) for H&J please? might try cenci too as they have plenty of suits in at the moment apparently...

Suits are a real nightmare - I suspect, sadly, your chance of getting one sorted for next week will be tricky.
Getting something natural shoulder in a fabric that doesn't stand out in a workplace (navy or grey), in the right size and condition is a big ask.

H&J are great, and could be a chance of finding something that does work, having said that. Also the Etsy shops are turning up some good stuff due to the sharp eyes of the those on here. Shipping will take a while.

Having undertaken a similar search on a low budget, it took about a two years to find something that worked! Maybe if you can hold fire and sit it out a little longer? Or, begrudgingly, get something cheap that isn't great in the meantime as a work suit?

I'm still searching myself.....

Happy searching!