LPG questions

Hi, New member, new to caravanning and first ever post so please be gentle. I have done a search to see if these questions have been raised before but only this thread came up but apologies if I am in the wrong department. Also, please could you keep the technical terms to a minimum as we are completely new to this.

We are about to pick up our very first caravan after selling our house and are going to tour wherever we want to for hopefully the next few years, health permitting. This will mainly be in Europe but also UK. My questions are

1. I understand that Safefill cylinders containing car type LPG is a mix of Propane and Butane. Not yet having an owners manual, will this gas run alde heating in our caravan?

2. Is it a good idea taking at least 1 safefill cylinder with us so that if we run low after a few months at least we can put it in the back of the car and nip to the local garage and fill it up? I know there are EHUs (look at me using the terminology) but just in case of an emergency.

3. Would the garage owners/employees have a moan about us filling a portable gas cylinder rather than a fixed one in a car for instance?

4. If the previous questions all come out aspositive answers, would we need to buy the continental adaptors in the UK before leaving or are they readily available in the countries we would be refilling in?

Thanks in advance. Ian