Thanks Anotonye,
This is the link to Caswells Europe and the product description
http://www.caswelleurope.co.uk/gastank.htm £45 for the kit for two tanks but from what I've read you'd use all of it on a Ducati plastic tank anyway. Probably worth getting a borescope for £20 off eBay to check coverage inside the tank as well. I've not looked into the prep/cleaner as I think I'll probably go to MRC.