Thank you, @SpinMeRightRoundBabyRightRound - I'm really pleased with it. I love the colours so much, I'm desperate for it to fit.
I got the division done last night and I think it looks OK. I'm back with the pattern now - had to fasten off and rejoin to get myself in the right place, as I realised my alternative method had brought me out in the middle of the skipped section.
It's weird though - you know how when you do Granny Squares in one colour, when you chain up to start the next row, your chain is either the first or the last in the cluster, so alternate rows are slightly different? Well, the pattern for the yoke is written like the chain is always the first one. The only way that would work (that I can think of) is to turn every row, but the pattern definitely doesn't say to do that, and when you get down to the body rows the pattern is written with for alternate first and last. I am sure I must be missing something, but I don't suppose it's mattered, I've ended up where I was meant to be eventually! It's just niggled me that I can't work it out.