@Aljrob Hi Aljrob, yes, I managed to get it working using the instructions from @lightwhisper. Instead of Google wifi though I use TP-link Deco. I was setting up Wireless broadband to amalgamate it...

@TechWeasel I have MR600 and Draytek 2865. Followed your instructions and it worked a treat. I am now load sharing across my crappy FTTN connection and a 4G Plus link. Thank you for taking the time...