I'd like to add to your thoughts Derek (if I may :wink2
When techs buy froM outside the UK they must be made aware that they are liable for any taxes, import duty etc that needs to be made on the products they're importing.
The transportation costs will be higher than if those companies were delivering to techs within their own country.
Special packaging for flammable goods costs a lot of money, it isn't as easy as just bunging it all in a box and off it goes, monomer (for example) needs to be packaged in special cat litter type substance to ensure that if there's a leakage it gets absorsed adequately to prevent a fire hazard during transit.
Then we have the distributors who try to evade paying the export costs, I know they exist because I've ordered from abroad before, I ordered some products and they were sent as 'nailart' when they clearly were not, that means that I was effectively breaking the law without knowing it :!:
There is so much more involved other than clicking 'pay and post'.