The impersonal season tickets suggested by other posters seem like a
good solution, but it's a shame they're priced at a premium. Travelcard
season tickets in London have just changed so that one doesn't need a
photocard. If you live close to the zone 6 boundary, could this be a
solution, maybe combined with a cheap single to the boundary?

Or are there any coach operators to London that sell season tickets
without requiring a photocard?

Dominic