Thanks for posting the info on this promo!
I'll be in scotland for several weeks in May and this is very timely. Edinburgh had availability only at the airport Hilton or Belford Hilton (69.5 GBP) (formerly National) for the variety of dates I checked. Glasgow Hilton (94.5 GBP per night) and Glasgow Grosvenor (69.5 GBP) had availability on all the days I checked there.
I was really hoping to get the Caledonian in Edinburgh at this rate. My hopes were dashed! The Belford rate is substantially better than my current reservation in Edi, but there were some pretty severe criticisms of this hotel on this board a few years back which has me hesitating to change over.