be prepared for some high taxes and fees and really horrid prices for food/bev/transport
Set yourself up on DLnet and see what the charges will be.
I personally avoid UK destinations because of them. I used to have a BF from Portsmouth waaaaay back in the single girl days, so I've seen quite a bit of England.
I prefer Eastern EU cities like Prague and Budapest--apts are cheap and fun! Where else can you buy fine paprika, tour castles and take a hot springs public bath with a few hundred other people in the middle of Dec?

I just missed an opportunity to go to EDI before DL dropped service from JFK, but maybe another year...
Are you the employee, Summer? You just have to be flexible--we lost some of the CVG service to EU, so loads may be hard to figure out until the traffic rates and the merger really settle in and so on...
I wouldn't make any concrete plans you can't fix in a day (or abandon) I just reversed a trip to Rome (23 yrs on S2) and couldn't get to NY that day, so I went to Vegas for the first time. I stayed less than 12 hrs but it was better than paying $$$ for a hotel in NY IF I could even get one...)

I do see that good nonrev timing is early Dec 2 wks after TGiving before the next hoilday period starts. ALso end Jan when people are reeling from bills but not as late as Valentines/winter school breaks. The first week in Nov is often good for EU. Just watch their holiday dates too.

Hope the hints help!
Wherever you go, there you are!
That's my motto--don't steal it, like Jumper [asked] with my "Carpe Trippem"