Matching a body to my Chassis

[beacongazer]

Hello, I've just been given a motorised chassis of a train and would like to build it back up. It's marked Hornby S 4581 and is an 0-6-0 and runs well,
Where can I identify what bodies would fit it and is it an easy job ?

[hairyhandedfool]

I believe the chassis is for a smallish 'tank' steam loco (think Thomas the Tank Engine) and maybe the old class 08/09.

[beacongazer]

Thank you very much for your advice, That narrows it down a bit.