Philip, read Investors Chronicle's excellent article at
http://www.investorschro...H04lkFVcEL/article.html This gives a good introduction and a link to an article entitled "IC TOP 100 FUNDS". This list of funds includes details on 49 investment trusts and while the article is not completely up to date I think that it gives sufficient information to allow you to zone in on the type of investment that you want. You can then research up to date performance and price figures on many web sites. (My favourite is Digital Look.) Access to the IC article requires registration but this is free.
If you wish to research individual shares my preference is a Digital Look site where you can specify specific parameters which will then produce a list from which you can make your selection. I limit myself to the following criteria: FTSE 100 companies only, dividend greater than 3.5% (you pick what is acceptable to you), a minimum of 2 times dividend cover, and PEG less than 1.0. (The experts suggest that a company with a PEG greater than 1 is too dear.) The site link is
http://www.digitallook.c...creening_tools/screener and once again you need to register (free).