In case you weren't aware, no '1500 hour rule' in the UK so having CFI (and all the qualification required to get CFI) you are probably 80% of the way qualified for a UK airline job if that's the way you want to go. Depending on what you're trying to achieve in life, it would work well to get a UK job, get a couple of thousand hours over a few years, and then go back to the US where the real money is. Enjoy, and welcome home.