Hello Naomi,
1. CAMRA = Campaign for Real Ale. The Station was a member, but don't know how far back their records go back in time.
2. The Landlady last year, may not be the current Licensee. The Station has changed Lessee a number of times in recent years. My daughter ran the pub for a short while (Jan to July 2007), before changing hands, and it has changed again since then at least once. (Thanks to Punch Taverns.)
3. The 'regular' - Frank, I mentioned used to visit most evenings, and apparently had done so for many many years. (If you do get hold of Frank, just mention Tony, Pauline and Katrina - he will remember us.)
4. Two other local pubs might know your family. The Railway Bell (01562 515680), and the King & Castle (01562 747505). Both are on Comberton Hill (at the end of Farfield), the latter being at the Severn Valley Steam Train Station, The Bell being opposite - can't think of the Landlords name, but he has been there for 'donkeys' years.
5. At the SVR Station,
https://www.svr.co.uk:8080/svr/WebObjects/SVR.woa/wa/specialEvents they hold 'war-time re-enactment' days at the end of June / early July. Many locals get there, they are very popular and busy days - and a great day out. This could be a good opportunity for you as many of the crowd will have been local to the area for a great many years.
I can't think of anything else to assist, so all the very best in your search.
Tony.