When we will see more Mid Cap UK stocks

I’m interested to know when we will get more stocks and ETF’s in general, I’ve been on FT for a while now and I’m not seeing as many additions as I was expected. My current watchlist about 80% aren’t on FT yet and its limiting what i can do. Now i’m paying for my ISA with FT I’m expecting a much wider selection otherwise its less appealing… I like the platform and the fact that i can drip my cash into my ISA through monthly share / ETF purchases with zero trading fees I just want more choices!