Evohome Installation Question

Hi,

I have just bought an Evohome Controller and 8 TRVs to install on my heating system. The boiler is a Baxi 105e combo boiler with an internal automatic bypass valve. The question I have is whether this ABV is sufficient for the system? I will not have any radiators without TRVs fitted so I'm assuming the only reason for the ABV is to allow flow as the pump overruns.

Thanks

Guyan