Thanks for the replies
If you have a permanent live then it should be pretty simple to add a switch. A bathroom is one of the few places where stricter electrical regulations apply. These are different for the different parts of the UK and it will impact on where a switch can go.
I live in Spain and have no idea what the regulations are here I’ll look it up.
So they expect it to have a switched feed, or are you missing an advance in tech since your last cabinet and it’s automated on opening the door?
I think expecting a switched feed the current cabinet is from the 80’s by the looks of it. The new one without integrated light was purchased was from Ikea (should have bought one with an integrated one in retrospect perhaps changing it would be the least hassle.