This is bogus story as far as I know.
E.g.
Israel not warned about blasts - foreign minister
07/07/2005 - 12:37:23
Israel was not warned about possible terror attacks in London before at least six blasts ripped through the city, Foreign Minister Silvan Shalom said today.
A Foreign Ministry official had said earlier that British police warned the Israeli Embassy in London of possible terror attacks minutes before the first explosion.
"There was no early information about terrorist attacks," Shalom told Israel Army Radio. "After the first explosion an order was given that no one move until things become clear."
http://breakingnews.iol.ie/news/story.asp?j=122106240&p=yzzyx68zx
Netanyahu had been on way to London hotel near blasts
JERUSALEM (AP) -- Israeli Finance Minister Benjamin Netanyahu was on his way to a hotel near the scene of one of the London blasts Thursday when he received a call to stay put, the foreign minister said.
http://www.usatoday.com/news/world/2005-07-07-israel-londonblasts_x.htm?POE=NEWISVA
Just heard. I should have considered the source. Thanks.