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Hello. Welcome to Just Answer.
On a home that new, I wouldn't be worried about a serious electrical problem.
It sounds like a connection came loose. I would look at the connection where the live wire branches to feed the switch for the outside light, and the switch for the living room light.
As for a light flickering when the switch is off, that's pretty unusual. It sounds like a low grade of switch was installed.
If possible, I would replace that switch with a better brand.
Yes, new switches would be a good place to start. I'm curious about "Persimmon builders". Can you clarify?
You are most welcome. Is there anything else I can do for you?
I'd love to visit the UK, LOL. Maybe some day. You have a blessed evening as well. I appreciate the opportunity to help.
This is sounding more and more like a loose connection. If you put a load on a loose connection, it will cause flickering, and it could cause one load to work and another not to work at all. It could be the OTHER wire for the lights... the one that doesn't pass through the switch. Are you able to post photos here?