Two good websites. One specialising in evening and wedding wear, also some nice accessories like cufflinks etc., This website was recommended by the Daily Mail and is really a lot cheaper than the high street. We have bought shirts from them and they are excellent quality.
http://www.mytuxedo.co.uk/Second website is more for the younger man. My son found it and said it's a really cheap site with lots of bargains. He bought some shorts which would also suit the older guy and again they were very good quality. They also have some good holiday shoes from as little as £4.50 a pair. The only thing about this site is they charge £5.00 for postage as standard so best to buy a couple of things, they also charge for returns.
http://www.twostoned.co.uk/sale/70% off Sale at the moment.