Are there parts source recommendations?
Vintage Jaguar parts and servicewww.vintagepartsource.com/jaguarparts.htm
There has to be Jaguar forums in the UK. They would know where to go or have parts for sale.
XK's Unlimited is where I get my parts. A new bonnet will be really expensive.
Looking for a Used E-TYPE in your area?
CarGurus has 19 nationwide E-TYPE listings and the tools to find you a great deal.