Scotland looks very nice but I think the weather has to be right too.
I remember once in the UK I went diving in Stoney Cove when it was snowing. It was not enjoyable at all and I was thinking that people must be masochists to enjoy this in these conditions (it was packed by the way). Also have dived in Wales (a place where is a sank sub with an aeroplane at 55/60 mtrs. We were making a 50 mtr dive to see it from the distance and take photos - NEVER saw it). Vis was at 1 mtr if that, it was blowing a gale and raining hard, sea was as dark as it could be. I thought exactly what I thought in Stoney Cove. But when the weather is nice and it had been in many of my dives is very enjoyable and you can take very nice underwater photos and videos that unfortunately do not have in Greece but in the UK.
We usually go diving in the Red Sea (Sharm, Hurghada or Safaga- going there every Easter for the last 10 years) and the Caribs (mainly Grand Cayman cause of the kids). All these places are fantastic!! Photos to follow
But all in all it will be brilliant
if we can arrange a dive in the UK and if the day is also nice it will be great too.