Not necessarily needed, if they are acting within their skillset - a nurse prescriber, for example, who has done relevant PHEC training and maybe a minor injuries course should be able to hold their own with ease as a HCP, similarly a paramedic should be competent in all the relevant skills and has drug exemptions for things like IV pain relief, anti-emetics etc without senior support. Both especially if they have first aid experience as well, as that’s actually a very different kettle of fish.
(I’d need to check what the rules are on paramedics dishing out OTC non-parenteral meds like oral paracetamol, antihistamines etc - unless anyone else can advise?)
Obviously, they’d be better off having clinical support - a fresh pair of (qualified) eyes, if nothing else - but they should be able to cope.
College of Paramedics provides some with their membership, covers voluntary activities, Good Samaritan acts, and non-NHS paid work separate to their main employment where the registrant earns less than £5p/a. Cover up to £5mil, I think, and you also get the other benefits of CoP membership.