Originally Posted by
ND76
Hopefully you'll be able to get a fast track pass while onboard your Delta flight so that your wait at the "UK Border" will be short.
When I flew through LHR in late May (I was in PE on VS and didn't have a fast track pass), my wait in the immigration queue was 105 minutes; that was actually relatively short, as some travelers were reporting waits of up to 3 hours.
Of course the ultimate situation may be if you are a citizen of the UK/EU - i believe they have somewhat quicker lines with "global entry" type booths. I haven't tried those, even though i'm a dual US/UK citizen. Unsure about the trouble it might cause.. someone once said always enter a country wielding THAT country's passport. Never tried.. but it has to be less hassle than standing in the packed immigration hall for an hour..