I was going to mention
ExMed which I thought were in Wales but having re-looked at their website I'm not so sure.
As for the litigation, this is a huge concern for many people and a debate I would not presume to be an expert on. However, I am a Secamb (South East Coast Ambulance Service) Community Responder, this is when I wear my pants on the outside.
However, during the day when my pants are firmly on the inside lol! I am a trainee litigation lawyer. Bring on the scorn!!!! Hows that for a conflict of interest.
It seems to me that the key is sticking to your protocols and not going beyond your training. For example I am trained to use, and keep in the house, a defib, give aspirin and hypostop when appropriate, assist a patient with their GTN, and a epipen. These things I can do as I'm trained and proficient in their use.
Through other training I am also proficient in taking BM's readings, checking blood pressure etc however, the ambulance service protocols don't let me do this and so I don't! This keeps me safe and the service safe from any claims. This wouldn't stop irronious claims however I feel confident that there is plenty case law to protect me.
I'd also add that any 'samaritan' law wouldn't stop people trying it on. I'd say that says more about society rather than the legal profession. But I guess I'm biased.