Continental, Delta, Northwest all follow with bonus miles offers to the U.K.

If you are flying on Continental, Delta or Northwest and connecting to one of their flights that go to London, Manchester or Edinburgh you may be able to earn up to 50,000 bonus miles in their respective frequent flyer programs. All bonus offers until June 30 and require free registration

Continental earns:
* 50,000 Bonus Miles on BusinessFirst round-trip tickets purchased and flown in J, D and Z classes
* 25,000 Bonus Miles on select BusinessFirst or Economy Class round-trip tickets purchased in A, Y or B classes of service.
See the full details and link to the registration page here

Delta earns:
* 50,000 Bonus Miles for paid BusinessElite/Business Class (fare classes J/C/D/S/I on Delta-coded flights and J/C/I/Z on Northwest-coded flights)
* 25,000 Bonus Miles for paid Premium Economy Class (fare classes Y/B/M on Delta-coded flights and Northwest-coded flights)
See the full details and link to the registration page here

Northwest earns:
NW World Business Class (J/C/I/Z) DL Business Elite (J/C/D/S/I) and earn 50,000 bonus miles
F NW Coach (Y/B/M) DL Economy (Y/B/M) and earn 25,000 bonus miles
See the full details and link to the registration page here