Looks like Draytek have had problems meeting the advertised spec of the Vigor 166 (chipset not ready perhaps?)
The blurb on their product page always quoted support for 106Mhz & 212Mhz G.Fast, but the model they've released (dubbed the V1) only supports 106Mhz.
They're now saying that a new version will be released (called the V2), probably in Q4 2020 or Q1 2021 which will meet the original spec. of 106 & 212Mhz support.
I don't think 212Mhz is used in the UK yet, (or perhaps anywhere?) but its worth noting if you want to be future proof.