Hi. If you have access to Williams on Wills it gives very detailed information about attestation clauses. There was a case called Re Selby - Bigge [1950] 1 All ER 1009 where the clause was
Signed by the above named [ABC] in our presence and attested by us in the presence of him and each other
Enquiries with HMCTS indicate that they like this clause as it allows them to check swiftly if the will was correctly executed.
I would say be careful as there are lots of claims arising from wills that are not correctly signed and witnessed. Its a vitally important. Simple solution always have testator and two witnesses present and signing at the same time.