I don’t want to be the harbinger of bad news but if you’re talking about an Amazon Prime UK account (and not just the language of translation used by the TV), did you know that from Jan 21 Amazon stated it has restricted access to its UK account holders to when they are based in the UK ( including Eire). This was because the EU policy of free access from anywhere in the EU ceased for the UK due to Brexit.
This will eventually affect all French-based owners of all UK accounts for all paid-for streaming services, which includes Amazon and Netflix.
An increasingly small number of VPNs are still able to help “put you back into the UK” but I’ve seen reports that even the best ones are experiencing geo-blocking. Some SF’er will know my company runs a service to solve the problem and if you find you’re affected you can PM me.
I also think your German guests sound great. My own son recently lost a leg (Army related) yet has the same mindset and is well on the way to reaching the highest levels in International Wheelchair Rugby. Who need 2 working legs if you still have a can-do attitude, one working brain (and car with the UK reg M3 LEG!).