Hi Lloyd, welcome to BLF.
I live down in Devon and use some of my torches while walking my Podenco, has some similar traits to the Whippet but also likes to climb trees, fences, scaffolding, etc. and has a completely uncontrollable prey drive.
Banggood and Gearbest are good and safe stores to buy from.
(Only Banggood is shipping batteries to the UK at the moment)
There are several members here that get us nice discounts on flashlights and accessories from both mentioned stores. I have listed a few of them and links to some of there threads below:
Members Fin7 (Banggood & GearBest) , M4D M4X and freeme
The GT mini and the C8 are great lights and good throwers, personally I prefer a torch with a bit more flood than those when walking the dog but its all down to personal preference.
I sell a few of my torches on eBay occasionally but unfortunately sold my GT mini and a couple C8’s end of last year. Only thing similar’ish I have for sale at the moment is a Utorch Sofirn C8F 3500lm Triple which I’m selling together with a 21700 4000mah battery and a charger