There's just the one H2O jacket - full name is Montane Lite-Speed H2O Jacket.

The Featherlite is a windproof, not a waterproof. The Velo is a bike version of the Featherlite.

The H2O is not quite down at the 10 quid level though, RRP is £100, although you'll find it quite a bit cheaper if you shop around.