Every company I’ve found is down south. Not willing to drive 100’s of miles to fill the system to find out time I get home it’s all leaked out.
Companies I’ve found are:
http://www.subzeroac.co.uk/classic-cars/ - Kent
http://www.air-care-automotive.co.uk/tl1.htm - Surrey
http://www.kwecars.com/technical/air-conditioning-the-r134a-conversion-myth/ - West Berkshire
http://www.oaktreegarage.net/Air-Conditioning-Services.htm - Pickering
There are more but can’t find any around Liverpool Chester area