Got the mash going, went to the pub, had swift few pints then back home again to sort the sparge out.

Recipe is:
3091g low colour maris otter
1000g flaked barley
500g roasted barley
140g chocolate malt
68g Northdown 6.0% AA for 60 minutes
Safale S-04 yeast.
Should be interesting. Very loosely based on a Guinness clone, but with some choc malt thrown in for a bit of interest.

Better get back and see how the sparging is going and hopefully my insect zapper is keeping the nocturnal six-leggers under control.