Welcome another UK member! The branches/polyps do resemble a Kenya tree for sure, and i once had a very large one which looked quite similar, as it grew bigger branches fell under their own weight and created a more plating effect. However I have seen corals in the UK like this sold as all sorts (finger leather, Kenya tree etc).
Hard to identify some of these leathers properly.
Just a word of caution, my large Kenya was causing all sorts of problems in my display due to toxins, it hit things like zoas hard and had to run a lot of carbon to keep it in check. Eventually removed it and now just have a 3-4 inch colony that I keep neatly 'trimmed'.