All school-specific services in Swanley are provided by Go-Coach, with services from Dartford, Sevenoaks and Tunbridge Wells. I didn't achieve a postable-quality photo of the D29 (too many cars) or the S10 (approaching from an unexpected direction at an unexpected time, owing to an incident blocking the route and doing it partly in reverse), but here are three such services.
The 477S acts as a strengthening vehicle for the main 477, starting at Dartford Girls Grammar, before serving the Wilmington Schools and terminating at Swanley Station. 9006 was the vehicle on duty on 5th June, as ever "adj. ASDA".
The D30 serves similar territory initially, reaching Swanley via Joydens Wood rather than Hextable, before extending to Eynsford and West Kingsdown. The vehicle then returns to Swanley as a 429. The foliage "opp. ASDA" makes for a rather nicer backdrop to 9009.
Finally, one of the oddities of the fleet, Metrocity 5501 is on the S12, which starts at Sevenoaks Schools, serving Otford, Shoreham, Eynsford and Farningham before Swanley, and extending beyond to Crockenhill.
It is again worth pointing out that despite Swanley being in Kent, most of the bus stops in the town centre (and served by 233) are looked after by TfL, although they have Kent QR codes affixed. This may explain some issues with inaccurate or missing information, e.g. outdated timetables on the stop at Swanley High Street.
Chris