Hi Andy,
I reckon that's a Celestion - have a look at the terminal board, I think that's the Celestion logo between the terminals and the magnet. Also, have a look at this picture:
http://www.hacker-radio.fotopic.net/p37254870.html
Updated scores:
- Goodmans with no bolts: 2 (My RP25, AM Herald RP35)
- Goodmans with 3 bolts: 9 (3 in RP18, 2 in RP25, 1 in AM Herald RP30, 1 in Jonsters AM Herald unnumbered - probably RP30, early RP10, Helsman RP36)
- Celestion: 2 (both Sovereign RP25)
- Elac (large magnet): 1 (my VHF Herald)
- Elac (small magnet): 1 (my Hunter)
Thanks again