Hi Moodymike.
I’m on the boat for the next few days but will post how I clear the holding tank blockage when I get back because the design on the 36 is absolutely appalling for access and I seem to have found a reasonable way if the blockage is bad enough to need rodding out. I.E can’t be cleared by pressurising the tank.
Regarding re gassing the fridge compressor, after a lot more phone calls and asking around I came across Polestar Cooling (http://www.polestarcooling.com) based in Bognor Regis. The owner Richard was very helpful. I called him at 1030AM and he was on the boat by 3pm. Regassed in 15 minutes at a very reasonable price.
He does not do a lot of marine work but is happy to travel to Chi and Portsmouth marinas if anyone else has any refrigeration problems.
Word of warning. If you have a Waeco fridge ignore their website info for fridge installers/dealers as it is so out of date it’s unbelievable. Of the 6 I called in Sussex and Hampshire only 2 were still Waeco installers and those 2 could not do anything for at least a week.
Also now I know that the gas in the compressor is R134 I can call any refrigeration engineer if it ever needs regassing again.
Regards
Rick