Interactive investor beats Digital look hands down, look at technical insight which has a very good charting option outlining the trend of the equity, note it does cover all the popular equities in the ftse all share and AIM top 100.
http://www.iii.co.uk/
The other one is stockopedia which breaks down the fundamentals according to various gurus
http://j.mp/SbOtdu
The first one is free and the second cost 14.99 per month which can be cancelled at anytime without penalties.
I use both and finally the other one which I have trialled and will be going to is IG Markets, its free if you deposit £1.00.
However the free trial is available for two weeks but does have a lot of limitations and bugs, overall it gives you live prices second by second to all the way to month by month and everything in between