Few more cities:
CHI-town for 2K Quid:
https://www.google.com/flights?lite=...;sc:f;sd:1;t:f
Washington, USA for 2K Quid:
https://www.google.com/flights?lite=...2*2.GBP.202242
SeaTac for 2.2K Quid:
https://www.google.com/flights?lite=...2*2.GBP.218442
The City of Brotherly Love for 2.1K Quid:
https://www.google.com/flights?lite=...2*2.GBP.211342
As always you can fly out of INV or BFS to bypass the silly APD fee (and gain an extra segment or five to your belt).
Hope this provides some marginal value.
Safe Travels,
James