LED headlight

Got a 22 plate Fabia. This morning, a message popped up to say check headlight. I noticed it was flicking when on full beam. Went into Halfords and they said because it’s an LED light it needs a whole new unit unless I can find a garage who would strip it down to just replace the bulb. This seems ridiculous that a whole new headlight unit will probably be needed. How much is that going to cost? More than a bulb for sure!! Has anyone gone through this and could advise of cost etc and what to do (apart from getting it done!)