Are You Being Served in HD or FHD

[Subtitles]

A relative has the boxset in DVD for the British comedy show from the 1970's Are You Being Served.
I have tried several times to see if the show was ever made in Blu Ray, but it isn't.
Streaming channel BritBox apparently has it in HD quality but it is not streaming in my country only in the USA and maybe in Canada.
I also checked the Amazon UK Prime Video but it says that the show is not available. Maybe this is because of geo restrictions but is available in the UK.
Please help by confirming that the show is indeed available in at least HD quality and on which streaming websites.
Thank you.

[jagabo]

That show was shot on video tape so any HD releases will be upscaled SD.