Well their promise of parts availability lasting until 2010 or whatever is bollocks although......most are still available, some of them are running out already.
I hope on Monday some of the frequently broken parts is still available. If XPart don't have them then it looks likely polybushes it will be then
have you looked on ebay for bushes??
I know 'Superflex' or is 'Supaflex'
make Purple polybushes which are direct replacement bushes to the rubber ones and 'give' more than the 'sports' ones they also do as well as 'race' ones coloured yellow and red.
Found the front ones in 'purple' but not the rears
http://cgi.ebay.co.uk/Superflex-MG-Z...QQcmdZViewItem
Jim