It will flower when the days of light become lower than 12/13 hours. Autos are the best way to go in uk. And now is the time to start them for sure, I have 5 plants growing in the woods uk too. They look ok, but they'll never hit their full potential I'm sure. Get a small tent and light and fan of you're serious about it, it will save you money in the long run. 🌱👍