Hi Cazza,
I presume this hock glass is acid marked on the base? If so, what is the mark, in order to give an idea of date.
I have checked my copies of the trade catalogues, but found it difficuly to match the pattern that appears tom be oon your glass - however to be honest that is a tad difficulut to make out properly

The cross-cut diagonal diamond is easy, but what's going on between is a little difficult to make out.
Nigel