Thank you once again everyone for your advice.
StatisticallyChallenged - you sound like an expert, so many options! Hugo Boss appeals to me. And I like Calvin Klein too - more so in States - for the variety of choice - but here in the UK I do buy quite a lot of Calvin Klein in TK Maxx too! All this made me think that I should probably wait until I go to States in November and buy the suit there! Then if that fails I can always carry on searching here in the UK afterwards.
Mosman - thanks :)
1605 - will consider Maxmara, never looked at it properly and have no opinion except that I know it's mega-posh and mega-expensive brand in Eastern Europe.
Itsgottabebags - yes it looks different, but I guess I need something safe, there's no need to make a statement as such at my work. I need to look professional, polished and smart but not pretentious.
CMOTDibbler - great idea to do a bespoke one - good fit is important and in my case a bit of a struggle. I'm well proportioned but because I'm so tall many clothes look awkward on me because they are not quite right in terms of the size (length, waistline etc).
suburbandweller - No, I'm not in London. Hugo Boss has a store near where I am so will be looking at them.
HorraceTheOtter, suburbandweller, noviceoftheday, battherat - thanks for your comments on black. I sort of feel the same but couldn't articulate. Will see whether I can get a sensibly priced black suit for the next 6 months or so, in addition to grey 'long-term investment' suit.
noviceoftheday - great point about accessories! I've got a good choice of top-end jewelry but will need to focus on shoes, bags, scarves and a watch.