I mentioned all of these at the very start of the thread. I use Parcelmonkey, Interparcel and Parcel2Go for smaller stuff but for oversized things you can't really use them cheaply!
Not dissing the other services whatsoever as I've always been happy with them (also Paisley Freight who brought my interior on a pallet - via TNT).
£13.90 for a bumper courier on eBay - collected next working day by City Link - delivered next working day after. I used them last week.