The fourth (and probably final) guest engine for the K&ESR's 50th Anniversary gala has been officially announced as ex-SR U class 2-6-0 No.31806 from the Swanage Railway.
https://kesr.org.uk/50th-anniversary-gala/
The completed line up (subject to availability) should therefore be:
Visiting locos
BR 7MT 4-6-2 No.70000 'Britannia' (at Robertsbridge)
BR 4MT 2-6-0 No.76017
SR U class 2-6-0 No.31806
SE&CR O1 class 0-6-0 No.65
Home fleet
Peckett 0-4-0T No.12 'Marcia'
Hunslet 0-6-0ST No.15 'Hastings'
Hunslet Austerity 0-6-0ST No.25 'Northiam'
Hunslet Austerity 0-6-0ST No.75008 'Swiftsure'
(Plus diesels possibly in action which could include BR class 03 D2023, class 14 D9504, class 20 No.20087 & Ruston Hornsby 0-4-0DE 'Rowntree Mackintosh No.1')
Tony