Thanks Lynn for your very kind offer - I have PM'd you.

I've managed to get some edge back through patient stropping - it now passes the HHT, anyway.

On that topic - if a blade only passes the test if the hair is one way round (ie when it catches) and it just runs over the blade the other way round, does that mean it doesn't really pass it?

I suspect I know the answer, but I thought I'd check...