Two things I need help with is, 1st just bought a new headlight washer cover as my o/s one has gone missing. And was wondering how to fit it after painting. 2nd is my stereo says the booster is off, so what actually is it I replace to get it going properly again. I thought I was something at the back of the stereo but dealer says there's nothing there.

The headlight washer just 'push fits' / clips on.

You need to pull out the arm that holds the washer jets - be gentle as it requires quite a bit of pull force.

No idea on the radio, more information needed. Is the 'booster off' a message you are getting on the display? Does the radio work? What else did the dealer say?