Pricey Thunder 2 (looks more like a 1A) eBay

My vote's T1A with a pickup change, I'm no expert though. Priced at £413.70 (ouch) LINK

T1 according to the trc
plus the TII didnt have that bridge

True (re T1 ref), but then it's got the 3 micro switches by vol/tone so wasn't sure...  No batt cover on the back though, so plot thickens... 

Looking at that, I'd say it's a Thunder I (version 2) with different pickups & two added toggle switches. The absence of a battery compartment seems to rule out it ever being a I-A (I'd be surprised if it's really active, unless they've managed to shoe-horn the batteries into the control compartment) & the extra two switches definitely don't seem to be original Westone.

It's quite nice (& I could find a home for the case ), but nowhere near £400-nice...

Yep, agreed, T1 wins  
Although reckon V3 as through body stringing. 
I'll get my coat...

punkyjam67 wrote: ...I'd be surprised if it's really active, unless they've managed to shoe-horn the batteries into the control compartment...

I've seen batteries jammed into many modern guitars with much less space in the cavity, but I have no idea where they would have shoved the circuit board. Could be attached to the inside of the cover plate with sticky tape I suppose, but my guess is that toggles are split coil / phase reversal / kill switch (the large handled one).