Hi Alfaman,
Like armani just said, I started out using adrian masseys site too a few years back. I do not know who is running it now. It seem to be up-to-date, but I dont use it anymore as the Bsps are estimated the last time I looked.
The best site I use is DataForm. It takes a little getting used to though. But once you are set up, it has historical bsp and isp results going back as far as you would need. It also has rankings and ratings of every thing under the sun.
But it is a little difficult to get used to.
I know Adrian Mount (RacingPost analyser) uses ProForm and swears by it, but I didnt like it.