These are really good little fittings

These are decent and the batteries should be reasonable too. This is actually a Menvier New Safe 8 in disguise rather than a JSB product, although since 1999 JSB and Menvier have both been owned by Cooper/Eaton, Menvier brought this design out under their own name sometime before that in the mid 1990's I believe.

@Kev: Thanks and its my favourite design of the 2000s era emergency 8W fittings @Beta 5: Oh thanks I didn't know these were Menvier in disguise and in fact I made an error, its Newlec branded not JSB

No problem, see here for the original Menvier design, they are all decent EM's though, what date does the battery in this one have?