Thanks everyone. I've ordered the Hobbs Saskia in Navy in a size 8 and I can't wait until it arrives. I might go back for the Petrol one if it is a success! However, I'm currently loving mustard / ochre and couldn't help thinking how nicely a Navy trench coat would have gone with my new mustard suede shoes today!
expatmigrant - thanks for the Jack Wills link - it has been a long time since I've looked at Jack Wills but they have some really nice things.