Constantly blown lightbulbs.

[Northbeach]

Yeah - I wasn't too sure what you meant by using a bayonet type fitting to measure the voltage. The light's always been a bit wobbly and I was never too keen, so replacement could be good.
I plan on having lights in the garden (front and back eventually). Might I be able to take power from this light? ...but that's for another thread and another day...

 

[Steve]

bayonet fitting is where you push and twist the lamp to fit it. Easier and safer to test the voltage on these
screw in fitting is obvious (i hope)

 

[Northbeach]

Of course! I couldn't see the wood for the trees!