I'd say it could easily be corrosion under the bead and the chances are if one has started to lose pressure because of this, the others won't be far behind

Had similar issues with 1 x alloy - losing several pounds pressue in a week.

New wheel? New tyre? - NO

The tyreman took the tyre off, cleaned around the edge of the wheel - put tyre back on and pumped it up.

He said he could not guarantee a fis but in my case it cured the "slow puncture" affect.

Most tyre shops use a bead sealer compound - black stuff that is brushed on inside the rim on the land that the tyre bead seals onto.

www.ebay.co.uk/itm/TYRE-BEAD-SEALER-RIM-SEAL-LEAKI...2

Pleased to say I am not a fool ( I think ) I am obsessive about any safety issue. I have posted that I will get back after the car has been in.

Thanks everyone for all the contributions.

Got the car back today - needed some additional work ( ouch )

Checked for puncture, none, needed resealing £12. Because large bill will do other tyres as and when.

Thanks again for posts.

That sounds great - can anybody recommend somewhere near Beverley ( East Yorkshire ) The car is possibly going to a young relative when we eventually change - so worth keeping looking good.

Also any recommendations smart paint repair shop ( light 'car park' scratch and 'ding' )

Thanks for any ideas

Thanks Mark, appreciated. I'll go there in the Spring.