Here is a deal :
http://www.network-railcard.co.uk/partner-card/
But you need to know a gold card holder :
"When you buy an Annual Season ticket at a station within the Annual Gold Card area and the origin and/or destination are also in the Annual Gold Card area, you are automatically issued with either an Annual Gold Card, Annual Gold Travelcard or Gold Record Card - you'll know if you have one.

One of the benefits of having an Annual Gold Card is that holders can buy a Network Railcard for another adult for just £10. This Network Railcard gives up to 1/3 off leisure travel in the Network Railcard area."