The Worcester hop shop recipe is very basic, but is all grain. It's easily converted to extract, and that would be a doddle.
For 23 litres:
2.4kg Light dried malt extract
34 grams Chocolate malt
31 grams Goldings hops 60 min boil
11 grams Goldings hops 10 min boil.
Ale yeast*
How?
Mix the extract into your biggest stock pot or pan filled to two or three inches from the top (but not more than 23 litres) and bring to boil. Then add 60 min hops. 45 mins later add 10 min hops. After a further 10 mins switch off. Cool the wort in sink, pour into FV via a sanitised sieve to catch the hops, add cold water to 23 litre line, pitch the yeast when temp is about 20C.
You could reduce the boil time by using more hops at the start of the boil. 50 grams for 30 minutes would provide the same bitterness. There's no need to boil extract, the boil is just for the hops. I'd be tempted to increase the 10 min hops too, for a bit more hop flavour - maybe 20 grams. 11 grams is not a lot.
* Yeast wise, Gervin/Nottingham is easy to use and would do the job, but you'd get a better flavour from Mauribrew 514 Ale yeast, closer to Lees I think, which I've had many times. It gives a less dry finish, a bit of sweetness to complement the malt and the hops.