Having read through this thread, here are a few I think havent been mentioned:
In the West Midlands I know that Rugeley Town (Brereton Sidings SB) and Droitwich are all mechanical: I believe Hednesford is also mechanical while Lichfield TVJ still has mechanical points but colour light signals.
In North Wales, aside from Helsby Junction, there are, I believe, also mechanical signals at Ellesmere Port (in part? Phil Deaves records EP as once having had 5 boxes of which not all are closed), Rhyl, Abergele, Llanwrst, Llanfair PG, Gaerwen, Ty Croes, Valley and Holyhead. I know that the NWCL - of which Llanwrst is not part - has other boxes (Talacre, Llanfairpwl and Mostyn Dock Jcn to name but three) but how many of them are mechanical I am not sure.
I hope to go doing photos on the NWCL when I get a chance.
Dave
North Wales Coast signalboxes as follows :-
Rockcliffe Hall - Small panel located in portakabins mounted on top of each other.
Holywell Junction - 54 lever frame controlling a mix of semaphores, two colour light distant signals, mechanical and clamp lock work points (although there are redundant sidings clipped out of use as well)
Mostyn - 40 lever frame, Controls mechanical signals and points. Box now opens as required.
Talacre - 24 lever frame. Controls a mix of semaphore and colour light signals. Mechanical points (connections to the former Point of Ayr Colliery all out of use)
Prestatyn - 45 levers. Controls signals only. Up distant signal is still mechanically worked.
Rhyl(former Rhyl No1) - 90 levers. Controls a mix of semaphores and colour light signals, mechanical points and clamp lock points.
Abergele - 60 levers. Semaphore signals, 2 colour light distant signals and mechanical points.
Llandudno Junction - NX Panel. All colour lights and power operated points.
Deganwy (former No2 box) : 18 levers. A mixture of colour lights and semaphores. Controls 2 level crossings.
Llandudno (former No2 box) : 34 levers (reduced from 86 in 1978). Semaphore signals and mechanical points except from one clamp lock operated.
Llanrwst - 20 levers, only 4 levers in use controlling signals each way. points are train operated.
Penmaenmawr - 25 levers. All colour lights and clamp lock worked points.
Bangor (ex-No2) - 60 levers (reduced from 90 in 1972). Controls colour light main signals, mechanical shunt signals and a mix of mechanical, clamp lock and motor worked points.
Llanfair PG - 4 levers (reduced from 18 in 1974). Controls the level crossing only. Signals protecting are worked from Bangor. (Crossing box ONLY)
Gaerwen (ex-No1) - 20 levers. Mainly mechanical apart from the distant signals each way and a level crossing.
Ty Croes - 6 levers (Reduced from 18 in 1993). Controls the level crossing protected by semaphore signals. (Crossing box ONLY)
Valley - 25 levers. A mix of semaphores and colour lights, clamp locks points and level crossing.
Holyhead - 115 levers (1 - 15 removed). Mechanical semaphores and shunt signals and clamp lock worked points.