I have a PTV/SRV value from a product specific British Standard test, is this the same as a BS 7976 PTV?

Probably, but not necessarily. Whilst the Pendulum will act in the same way on all floor surfaces tested, different methods can involve different rubber sliders or contamination, which may or may not be representative of end use. For most floors you should seek wet PTV’s >35 using the 4S/#96 rubber, for barefoot areas seek wet PTV’s >35 using TRL/#55 rubber. If you are unsure send us a small (300x300mm) sample which we can test in house quickly and inexpensively, providing an independent BS 7976-2 slip test report.