Hi. Could anyone tell me if a beta zero should have an expansion/header tank on the cooling system?

Not that I remember but it's been a while.

yes iam sure it does under the tank panel

Many thanks, I thought that it should have one... but in that tiny space, it must be small.

Should be a second hole in the shroud next to the gas cap.

Happy new year to all... Yes there is a second small hole in the shroud, about the size of the overflow pipe on the radiator filler cap lineaway. Is this what you are talking about?

Second cap is the overflow.