As far as i see I have 3 options...
Charles Tyrwhitt, T. M. Lewin and Hawes and Curtis (dont have suits on their website). Are there any other places I could pick up a decent suit for around £150 - £300.
didnt think about that one... any idea how the quality compares with the above??
also the budget is somewhat flexible, however i would like to buy a few suits and that is the reason for why i wrote only £150 - £300
i think, though, it would be better to get 2 good quality suits for the price of 3 mediocre suits.
My experience with M&S is that their trousers seem to be made to flatter the larger gentleman, so unless need flattering in that way, I would be careful. However, I would say that their suits vary quite a lot from range to range so best to try them.
To be honest though, if you only want to spend that much on a suit, I would make weekly visits to one of the larger branches of T.K.Maxx until something half decent appears in your size. They do get some reasonable continental brands in there now and again, like Daniel Hechter, Pierre Cardin and so on, that are going to look better than anything M&S can offer.
Otherwise, go with Lewin.
M&S suits at that price level are made exactly the same way AFAIK. The OP wants a cheap suit and he's going to get a cheap suit and fusing isn't the end of the world at this price range. I can't imagine you are ever going to get a Gieves & Hawkes suit even at a sample sale for £150-£300, unless you can tell me different. At least the T.K.Maxx option means you have the chance of something better, but it is only a chance, and as you suggest, you have to make sure you are getting what you want. Another option is the Paul Smith sale shop in Avery Row in London, but you can't guarantee that they will have something in your size that you like at any particular time. And the prices are still only occasionally in this band. The place in Bicester sounds great...
Those are some pretty serious bargains there. I have to admit, I didn't think you could manage to find G&H suits in this price range.
Just try a couple of suits from the mentioned brands and pick the one which fits best. I've voted for CT because they have a really nice range of suits. Last time I was in London I went with Lewin instead, though. It simply fit me better.
One more option would be Boggi Milano... very sharp suits and reasonably priced. Quality-wise only slightly above CT/Lewin I'd say, but obviously more Italian-style (modern without being too trendy).