These are genuine Hornby parts, they are brand new and factory sealed. As found on service sheet 315B for Railroad Flying Scotsman R1075 (set version) sheet 316 For Railroad Flying Scotsman R2675, and sheet 344 for Railroad Class A4 R2779 & R2784X. All loco drive.
Please check out my other listings for hundreds more Hornby items.
I dispatch on the same or next working day depending on what time you pay.
Sorry no collect in person, all items are post only even if you're local.