(...)I picked it up at an auction in Dorking for £32, (...)
Great deal!!! :hiclp: 32 for such kind of reticello is really a good buy.
Imho this reticello is really nice, well streched and developed.
I like the stem a little less than cup and base, due to a little too thick, but if you want to use it it is better to have a stronger connection between the 3 parts.
Value: on new items I can tell you a retail value between the 200 and the 400 Euro in a good murano glass shop (not in "turist trap factories").
You can find similar reticello pieces for less, but this reticello is really well done and it is not a cheap commercial reticello.
If it is of actual production (last 10-20 years) the first name I can tell you is Giuliano Ballarin. He produces very complex reticello and filigree, but on a little too heavy bases and stems (imho).