I stayed at the Park tower several times this year and prior to that, I always recieve those e-mails just days prior to checking-in.

I never payed since I know that I will get that executive room as a supgrade which happened to me everytime I stayed there. So it's not worth paying the 60 quid really. They never upgrade to any of the suites. but if you were a plat, you should get upgraded to a suite based on availability. Especially if it's for one night only.

Just an advice here, if you get an executive room try and get it on the 14th floor which is all newly renovated rooms and much better than the other exec rooms. (It's non-smoking though).

I've stayed there less than a month ago and got upgraded to an exec room on the 7th floor I guess but it was a smoking floor and I literally couldnt sleep at night, so I called them up and told them regarding this issue and they gave me one on the 14th floor and it was one of they new ones too.