Regarding buses to JHGS these look like being run by parent groups only so have been in touch with them to arrange a place.
I have now managed to secure place for my son on one of the service. ( thanks to LALady for giving me the contact of third bus service )
For SWB I suppose you need to ask here or get in touch with parents of children already studying there, and do it quickly !
Can't help with the JH bus, but I am curious where you applied for the bus - we are in a similar situation with SWB. Does anyone know of any bus that runs form Maidenhead to SWB, what the route is, where the stops are etc? And how to get on any list?
Thanks for any info (and good luck!)