I got most of my bits yesterday whilst at Vx.

The dealer did indeed try to say that the repair plate was an invalid number, as stated in the How2.

Having told him that i knew he would utter such a sentence, he checked with Vx, and low and behold, the cry was 'Vauxhall recognise it'

Four plates on order.  

Was gonna try changing the bushes first though to see if it makes any difference, whilst i'm waiting on the plates coming.