Too many wires

[Keen to learn]

Morning guys, recently had a new kitchen fitted and now the cupboard door in the utility catches on the existing light fitting (tall cupboards). I've sourced a shallower one which will work and I would usually have just swopped it over but this is what I'm faced with, any ideas on how I proceed at all please? To my limited knowledge it looks like the black and blue go into the same connection and there is an additional yellow one (live) and also the earth.
Help if you could please

 

[Harry Bloomfield]

You have a looped in live, the two reds, and looped in neutral, the black and the blue. The yellow is the switch wire, which becomes live, when the switch is turned on...

 

[EFLImpudence]

Transfer this to the new light and connect the new Brown and Blue wires to the same terminals as the old Brown and Blue were connected.

 

[Keen to learn]

Thanks, that makes perfect sense now. Appreciate your help