A spam I received recently gave me two pieces of information.
HEATHROW QUEUES RETURN
Delays of nearly two and a half hours reported
THOMAS COOK HALVES COST OF OLYMPIC PACKAGES
Tickets unsold with only weeks to go
Who would have thought that Heathrow Immigration would be the only factor between London and a total overcrowding of tourists? Although, if you think about it, the immigration authorities job is to keep out unwanted visitors, and we certainly don't want millions of tourists cramming into London at a time when many of the roads have been halved in capacity.