To be fair, if you have £1 invested, you should win once every 24,500 months, which is once every 2,042 years. I’m not that surprised you haven’t won yet!
EDIT: That said I have a friend with a similar investment, which I told him was a waste of time (for the above reason). His response was that he doesn’t play the lottery, but wanted to provide God with a means with which to give him a big win, just in case the big man felt that way inclined one day. 🙂