I think CALMET have UKAS certificate 0143 and the UKAS website has their UKAS certified schedule here:
https://www.ukas.com/wp-content/uploads/schedule_uploads/00001/0143Calibration%20Multiple.pdf
This shows how accurately Calmet can generate and measure DC/AC voltage and resistance etc. It appears they have quite good capabilities in some areas but maybe average in others.
If the link doesn't work you can go on the UKAS website and search for them there. You can also do regional searches, eg I found 7 UKAS accredited cal houses in Scotland for example.
Ah, cool! If there are cal houses in Scotland that have the same capabilities and I can find a few reviews or whatever I may use 1 that is in Scotland. If only just for the fact I may even be able to drop off and pick up my meter myself therefor eliminating the need to hope I get a decent courier to transport my meter.
Off subject a little but..... a couple of years ago I gave up fly fishing so sold my entire collection of fly fishing and fly tying stuff. To cut a long story short 1 older gentleman seen me selling my stuff on Ebay and let me know he was just getting into it as a new pass time and was interested in my whole fly tying station. So I sold it all and packed the 3 tying vices separate since they were very heavy and the rest of the stuff was quite delicate.
When I posted the 2 big parcels and as I left the post office the Postie van drew up to collect the days out going parcels. I was on the other side of the road lighting a smoke up as he came out opened the back of the van and started literally launching parcels in! I saw and heard mine landing! I knew the vice bases would be fine but anything they landed on that wasn't well packed would be toast! The guy was back in the van and off before I could pull him on it! I was fuming! A few hundred quid of decent stuff launched about like rubbish!
I went back in and reported it but the woman couldn't give 2 hoots! So I phoned up and was basically told if anything is damaged put in a claim. They weren't even too bothered to get the details to tell the driver to be more careful!
All the stuff I posted was fine but someone would have got flattened parcels from that load for sure!
I would much rather drop off and pick up my meter myself if possible so I will check and see if there are any near me.
Thanks very much for the help everyone.