Does anyone know if the B6 shocks can be rebuilt? I think mine may be past their best and as they are no longer available for the front I wondered about getting them rebuilt but don't know if it is possible.

Any advice gratefully received!

I do believe they can. I certainly read somewhere, just after I ditched one of mine as it was leaking. There are other refurbish companies out there that can do this.

Bilstein UK have a damper rebuild service, they can even rebuild to your own spec if you want to go firmer or softer on the damping. Give them a call.

https://www.bilstein-shocks.co.uk/pages/bilstein-rebuild-service

Thanks for that, I'll look into it further. I know someone locally who does rebuilds so will also talk to them but getting Bilstein themselves to do them is tempting.