Fabric covered Austin 7’s

[AllAlloyCup]

My friend Neil is also building a GE Cup and is researching a suitable
fabric to cover his project.

The original covering for many Austin’s was Rexine manufactured by ICI Ltd. 
This is no longer available I believe.
I see from an advert in an early edition of R T Nicholson, that as well as making Rexine
ICI also made a leather cloth called “P-V”. Does anyone know about the P-V fabric? 
and what is the best choice of modern made fabric that’s
A) waterproof
B) has some flexibility
C) and is UV resistant

I think this subject surface before but did not
Come to a definitive conclusion?

Regards

Bill G