Investment Forum - details of items on the "corporate activity" list

I was looking for a couple of pieces of information and googling turned up your "corporate activity" list, which just basically lists my questions without giving the answers
(I'm looking for
a) the capital gains treatment of the B shares issued by southern electric, so basically "for every X old ordinary shares, Y new ordinary shares and Z `B' shares were issued, with x% of the capital cost going to the new ordinaries and (100-x)% going to the `B's)
and
b) a breakdown of the distribution of national grid shares by the regional electric companies along with the capital gains treatment (so basically a list along the lines of "for every X EMEB shares you had, you got Y National Grid shares, with x% of the capital cost going to the rump of the EMEB shares and (100-x)% going to the National Grid shares", with similar figures for the other companies, and the capital gains treatment

Do I have to buy Tolley's, or is this information available online somewhere ?

(I'm sorting through my parents' stock boxes (they've basically thrown stock certificates in boxes over the years and not kept very much in the way of records)

Firstly the Tolleys guide (http://www.amazon.co.uk/gp/product/0754534510?ie=UTF8&tag=shawor-21&linkCode=as2&camp=1634&creative=6738&creativeASIN=0754534510">Tolley's Capital Gains Tax 2008-09: Main Annual) is a lot more expensive than I mentioned on the website!
There might be a copy available at a Reference Library. Basically it lists all the different stocks with price adjustment factors that take into account what action you took as regards any corporate action.
Another way might be to register with a broker and get the information from them.
Failing that you could do it yourself. This would involve finding the historic prices for the various split-offs for the different classes of share. Quite laborious, but the prices wouldn't have to be THAT accurate (you could get them from charts or I would probably be able to get them for you).
You could also try the IR Capital taxes office or maybe the company registrars.
Don't forget the tax liability only arises when the shares are disposed.
If you are thinking of selling any you could work out the approximate cost of the shares before the split/bonus whatever and if this is miles under the CGT allowance you maight get away with a short explanation (or none at all!)