The following are all walk up fares with GroupSave 4. Slightly more expensive than possible Single Advances with F&F discount, but more flexibility and inclusive of Travelcards.
1. Maidenhead to London Zones 1-6.
GroupSave 4 Off Peak Day Travelcard
* ^31.00 (4 adults @^6.75, 4 children @^1.00)
For the trip out to Swindon and back to Maidenhead you may as well buy a return to Swindon from London Paddington and travel short on the return. Split this fare at Didcot though. And remember to take a London to Swindon service that calls at Didcot. Your 2311 return does.2. London Paddington to Didcot Parkway.
GroupSave 4 Off Peak Day Return
^47.00 (4 adults @^10.75, 4 children @^1.00)
3. Didcot Parkway to Swindon.
GroupSave 4 Off Peak Day Return
^22.80 (4 adults @^4.70, 4 children @^1.00)
Total: ^100.80 (4 adults @^22.20, 4 children @^3.00)
GroupSave 4 will give you a greater discount than the F&F Railcard on these walk-up fares, just 'pretend' one of the children in the group is an adult. It is perfectly allowable to buy an adult ticket for a child.
*If you are planning to buy online with
FGW▸ then enter
Zone 1 as your destination ensuring you have also requested a return journey on the same date. Then the booking engine will give you the Travelcard option at ^31.00.
Edit to add: Of course you can buy the Advance Purchase Singles, using the F&F Railcard from Paddington - Swindon and Swindon - Maidenhead to save a few more quid on the walk-up fare prices I've quoted. Although I can't work out how you got a total of ^43.50 for
PAD» -
SWI» . I made it ^43.65.