Dunelm Mills - mainly furnishings and fit out.
I note that Dunelm Mills seem to deliver to the 'extremities' at no extra cost. They are my go to supplier for a small number of things such as curtains and curtain tracks.
They do, however, reserve the right to take an extra couple of days, and do not do express delivery.
That includes free delivery over the same threshold as everywhere else. It seems to be orders of £50 or more that are free delivery, but the categories and thresholds are moderately complex, so read the policy.
http://www.dunelm.com/info/help/delivery
Ferdinand