There's a lot of talk about Scots travelling FROM Scotland to England, flying out to wherever and back again with no quarantine requirements, then back to Scotland to get round Scottish restrictions, but no-one seems to be considering that English people could be doing the same, just without travelling from Scotland to start with, then VISITING Scotland. Both ways could bring the virus into England and Scotland alike!
Not meaning this as a Scotland v England thing, but just that these things work both ways.