I book a normal standard double - never exec, premium, business etc.

Drop them a mail and ask, as a concierge member, will a suite upgrade be possible?

Worked so far in; Rome, Istanbul, Cardiff, Budapest, Bucharest, Prague, Paris, London, Liverpool & Manchester. I'm sure there are more but I can't recall.

Only issue was New York - I got a rather rude reply saying they couldn't offer anything and it will be first come / first served... Checked in couple ok weeks later into a suite!

If you ask they usually respond well to Concierge!

I did spend 165 nights at Radissons in 2012 so it's the least I expect!