as you plan on using it in the wonderful city of hull.i'd sack off the gears make it a single speed and paint it with emulsion which might help stop it getting knicked and given the steepest hill will be a flyover or railway bridge you ain't gone need 20 + gears.
also proper mudguards are a must unless you like sitting around in wet shreddies.
although single speed may sound attractive, the drop outs on your trek won't allow for any tensioning of the chainthis'd mean installing an eccentric bottom bracket, perhaps a cost you'd rather avoid