The demo at http://eu.draytek.com:10130/

Has tr069 ipv6 all the things i want but 3.8.3_bt firmware has none of that - should i install the non local firmware otherwise it looks like my dual stack project with our isp is dead.

Also missing is our pppoa sign up data fields

Should i have bought the cheaper dlink modem ?

The demo you link to relates to the European Vigor 130 router and is NOTHING whatever to do with the UK Vigor 130 modem , ignore those pages completely.

This model is designed to be used in conjunction with a cable/dsl/vdsl router

All the information for your model is on the DrayTek UK pages.

As a modem you don't need to "sign up" for anything in most cases, the modem works out of the box.

Your device is a modem and will not work as a router no matter what firmware you try to flash.

Ipv6 works fine.

This is the relevant page you need to read :

https://www.draytek.co.uk/products/business/vigor-130