LPG prices

And that's the other one ,3.2 L on lpg

Not quite, but not far away. Up to a 10% increase but less than 50% of the price.

I'll be adding it to the map shortly, he isn't open all day and evening so want correct times of him.

But this guy; https://alternativefuelcompany.co.uk/

Was getting 16.7 mpg for combined driving, mostly town, some Motorway, a bit of towing.

Now getting the equivalent of 35mpg for same driving. So maybe 45-50 on Motorway.

Which is better fuel economy than the diesel counterparts.

Would there be lower Co2 emissions by using gas ,

UK to lose half its LPG filling stations by 2024 – replaced by electric charging points

https://www.hagerty.co.uk/arti…ng-points/

This has Probably been asked someone on the forum but just to refresh, so just to be clear lpg is what you fill up with the Gaslow system for cookers an heating, I drove past a garage yesterday that says auto gas on the pump housing and lpg on the digital reader glass, I’m taking it this is the correct type, just says lpg , that’s it , but the garage staff was filling a cylinder up for the customer, suppose what I’m asking is, you can’t go into a forecourt and see different types of refillable gas types,

First off. It's totally illegal, as in against the actual law, to refill a gas cylinder without a built in automatic cut off valve. So if anything went wrong with what you witnessed the garage's insurance would invalidated.
Regarding your query.
Propane, butane, cargas, autogas, etc are all LPG (liquid petroleum gas)
LPG for vehicles is generally a mixture of propane and butane, the mixture varies in different countries. In southern European countries the percentage propane can be significant but in colder northern Europe countries it can be 100% Propane.
Here's a very good link which explains all
https://alexlpg.com/en/summer-…in-poland/