That’s strange that it said return to send if it never left the UK (how would they know the address was wrong in foreign lands)? I’ve ordered many times from RB (shipping into Europe) and some have taken time to arrive but I’ve never had any issues with RB deliveries. I had an issue with a busted vape cart and he did replace this for me so from my experience his customer service is very good.
No consolation for your financial loss but I’d definitely order in smaller amounts going forward (I do just because of the legal risk of getting caught with more than 3.5g - it’s a pain to order more frequently but it negates the legal risk and the financial risk if it does get lost). RB is very clear on his no reship for lost international orders - it’s a risk we all take I guess.
You can only put this down to experience I hope it has not put you off the amazing vendors on this site.