The efficiency from the recipe in the book seems to be a little high for most brewers. I will post the original recipe but you may need to tweak it a little so that you can hit the gravity marked based on your system's efficiency.
4lbs Maris Otter
2lbs Pilsner Malt
10 oz White Wheat malt
Mash at 147 - 148 for 60 minutes
Add 8 oz of piloncillo, demerara or similar unrefined sugar to the boil
1.25 oz Challenger Hops 60 minutes
.5 oz Challenger Hops 30 minutes
.5 oz Challenger Hops 5 minutes
.5 oz Saaz Hops 5 minutes
Use your favorite British ale yeast
Alc by Vol: 3.9 - 4.6%
I have made this recipe or variations of it a good amount of times. It always turns out a stellar beer. One of my favorite variations is subbing Sterling for the Challanger and Liberty for the Saaz. If you are looking for something light, refreshing, drinkable, and moderately hoppy I highly suggest trying this one out.
This recipe fermenting
Finished product (not the best picture) it is much lighter