OK folks, it's had 8 weeks in the fermenting fridge, 3 weeks in the bottle and 4 days in the fridge. The results... it's delicious.
It seems like the WLP820 and M76 were able to put their differences aside and work together. Unfortunately, I smashed my hydrometer shortly before I was planning to take an FG reading but it feels like it's about the right strength and has a lovely malty sweetness to it.
I tend to struggle to condition at the optimal temperature this time of year, so the carbonation's not perfect. With a bigger head and a proper stein I'd be onto something.
Thanks all for your help.
Cheers!