Wobble there are three push button light switches on a 744 at the top of the stairs for the rest area. It would be very unusual that all three get broken. The electrics are a mulitplex system where there is no direct link between the switch and the lights. Same with passenger reading lights. That is why the CSD can switch reading lighs on or off from the computer in his/her 'office'. There is no such override for the lights in the crew bunk rest area unfortunately.
The reason the lights occasionally stay on in the rest area is due to a fault in the mulitplex system, not some sort of sabotage of the switches for financial gain as you have scurriously insinuated.
Generally as BA cuts back on expenditure, many of my colleagues are experiencing a deterioration in the onboard systems such as AVOD and aircraft being dispatched with unserviceable toilets. It would help that when faults are reported, that they are fixed back at base. It is not unusual for aircraft to be sent out with faults such as bunk rest lights stuck on, as hard presseed engineers at base prioritise repairs.