Thanks again Derek!
I saw this one listed on the Bay http://www.ebay.co.uk/itm/LEXUS-F-2008-2009-2010-GRILLE-w-o-PRE-COLLISION-/190579152843
which looks like it will fit, I have contacted a local main dealer in Ipswich and passed on the part number and I am pleasantly suprised that he can get one in on monday morning for £93 inc VAT!
I have no idea why Lexus Norwich quoted me £643 !!! it just goes to show that main dealers employ some right wazzaks!!!
Ipswich did not want a deposit, and are happy that I will not buy if it does not fit!
Watch this space, I will take some pics and let you all know if it will indeed fit or not as the case may be!