Can anyone recommend a decent 12v tyre inflator for general motoring use. I have a really old one which has always struggled to get any air in the tyre in a reasonable time so wondered if things have moved on somewhat.

I just use my track pump

APF

Ring rac600 I’ve got one it’s pretty good , what car best buy as well
http://www.theultimatefinish.co.uk/wheel-and-tyre-care/tyre-inflators.aspx

Ring rac600 +1

I had a £10 job from asda which seemed to just deflate tyres.

One of these. designed for 4×4 tyres, but will work very well with car tyres ( though you won’t need to switch it on for long ).