Thanks for the reply Trolleybus.
Drayteks are not cheap. Something in the same region would be fine.
Was really hoping this thread would have brought out some suggestions.
The killer in your wish list is a built in VoIP ATA - There are very few routers that have that capability. A compromise would be an ASUS DSL-N16 Wireless-N300 VDSL2/ADSL2+ Modem Router and separately a Gigaset N300 IP PSTN & VoIP/SIP DECT Wireless Base Station to which you can add any POTS phone of your choice. Total cost around £150.
At the other end of the scale of expenditure would be the Draytek Vigor 2865Vac for around £400 to which you would add a POTS phone of your choice. I have tried both in my home with the performance of the Vigor being pretty impressive for both internet connectivity and the footprint of the wireless signal. The only downside is that there is no passthrough onto PSTN.
It really is the case that the more you pay the better the product together with a host of addons that you may have a need for.