Looking through some old posts - before I post another one - and I realise that I never gave the outcome for this one.
March 2019 changed from BT Retail for telephone only to BT Business phone and ADSL - we get a good speed.
For WiFi had two Ubiquiti access points fitted by a local guy. I was unavailable and he has installed before and was happy to run the cabling etc.
End result everyone happy.
Andrews & Arnold FTTC DrayTek Vigor 2762ac Cisco PAP2T and HUAWEI E5776 with O2 Data SIM