I expect they could ship you some. It probably isn't a prohibited substance.
I have used this Meguiars product for years on lacquer finished guitars. I have wiped down my newer Alembic basses with it, but not the older ones with the matte/satiny finish. I kinda' like them like they are. But this stuff is great for getting smudgy, fingerprints, etc off, and restoring a nice gloss.
No idea on availability in the U.K.