From the First Great Western website (link below.) :
http://www.firstgreatwestern.co.uk/Content.aspx?id=786

"A long week at work (or trying to get to work on the train - Lee) making you tense and tired? Want to spend more time with friends and family?

Weekends were made for leisure and pleasure, so why wait for the summer holidays? Go this weekend!

First Great Western are offering season ticket holders (of one month or more) a great excuse to get out and about. This special offer allows you and one additional adult and up to four children to travel at the special discounted rates below, anywhere on the First Great Western network.

Travel on any Saturday or Sunday between 27 January and 18 March 2007

Each adult (you plus one other) – £10 Standard or £20 First Class day return
Each child (up to four) – £5 Standard or £10 First Class day return
Tickets valid for anywhere on the First Great Western network."