Hi Shed,
I may be wrong but to qualify for reward saver fare of £35, you must have have had activity on your exec club in last12 months. Ie booked something using avios . Equally , the account must be12 months old.
I sometimes use my points and book one way BHD to DUB ( yes I know sounds mad) and it asks would you like to make a stopover, I say yes for london eg 3 days and continue my journey = 4500 avios and £17.50. Technically 2 for 1. Excellent . Same may be possible say edi to GLA but you'd need to check.