You might consider taking it for test without lights and having what is affectionately known as a "daytime" MOT. You have an advisory that says "No lights fitted at time of test". It means that you cannot drive it at night, but you may not be planning to.
Discussion on PistonHeads -
https://www.pistonheads.com/gassing/...f=10&t=1696934
Yup, I know it sounds crazy, but there are plenty of dirt bikes that run legally with only a brake light.
My Ferguson is legal with no lights at all...but only during the hours of daylight.
See page 8 -
http://www.transportoffice.gov.uk/cr...Jan%202009.pdf
They talk about bikes, but it applies to all vehicles.