Hello Impish,
Plan on layers, when packing. Especially with England's whether being so changeable (my favorite, was one old Cornish woman saying, "We don't get weather -- we get 'bits of weather'...a bit of rain, a bit of sun, a bit of cloud...all day long").
So, bring at least one pairs of shorts, and a couple pairs of long pants. I usually go with a couple short sleeve shirts and at least one long sleeve. What I like to do for coat(s), is pack a zip-up, hooded sweatshirt, then a light, waterproof jacket to put on over it for those really cold, rainy days. Or if it is a warm, rainy day you leave off the sweatshirt and wear just the waterproof one.
Leaves you lots of options...you may not be styling, but you'll be warm and comfortable. Who knows? Maybe the WWM Worldlook will take off one day...
worldwidemike