Old school!
Yep, done that and it works great. Will no doubt re-do when the chapters are inserted too. Having downloaded the mkv file too, put that on my memory stick and plugged into my telly (bearing in mind there was a codec issue on the mp4 for me, and that's why I needed to burn to disc in the first place) it worked fine...sods law.
Cheers, as always, for you help ninjaw and TheBang.