Well, the boys' last names have been changed from my maiden name to my married name!!
MANY thanks to elle for helping make it all happen!!!!!
We did it by Statutory Declaration, since that's the only way the Embassy will accept name change for the passports. Well, they accept it - but they also want THREE forms of ID showing the boys using the name!! They are children - what 3 forms of ID should they have?!
However, the Social Security office DID take the name change - so the SS cards will be one form of ID. The new NHS cards will be the second. And their school records once they return in September will be the third. So I can't get the passports changed as soon as I'd hoped, but it won't be much longer. In the meantime, the names have been changed at the GP, the dentist, NHS, Social Security...we'll be sending out "change of name" announcements to family and friends as well.
Anyway - not sure how many others there were/are/will be in my position able to do this. But I wanted to pass on my experience anyway!