I don't think so and I've searched for it
I would like to try it, in lieu of using an automotive clear, so I contacted aoc resins in Essex, who are the UK distributor of Hawkeye products. They stock some of the Duratec branded resins, but not Sunshield. However, I spoke to one of their sales team and he said he can order a gallon of it for me on their next shipment from the US.
If anyone else in the UK would like to try this product, then might be a good idea to contact aoc-resins.co.uk.
If enough people do it might encourage them to make it more readily available here.