I've been lurking on T2 for days waiting for a good deal. And now it appears to be free delivery! Up until now delivery was usually only free on a £30+ spend, and otherwise quite steep, e.g. £5 delivery on a mug... £7.50 delivery on a teapot. Yes stuff on this site is pricey, but if it's what you want, today is perhaps the day to make your order.
EDIT: yes, it's now official: "Free standard shipping on all domestic orders! Ends 11.59PM GMT Thursday 15 December!"