Four years ago my dad got an official caution for cannabis with intent to supply. Hilariously, the police arrived for a completely different reason; phoned about a break-in by neighhours while nobody was home, not drug related either and just happened to stumble upon his operation. They also didn't give a single fuck, had a cup of tea with him and literally said "we left you an ounce".
I have no history with the police. I've also had no problems ordering domestic.
I'm wondering how that affects me for international orders to the same address, is it a no-go?
That was just an excuse used by the neighbours to snitch on your pops.
Most likely that incident won't affect your dnm use at all.
Also, try posting on /r/DNMUK when you're looking for UK related info.