Bah humbug -- back from a day trip to Wales, but there'll be no new prosthesis for Christmas.

In truth, it's worth waiting another few weeks -- and I'm extremely fortunate to have a prosthetics team that's committed enough to put the effort in to ensuring my new limbs will be as good as they can possibly be.

First, the Cheetah.

The issue here is that the foot is designed for track sprinting -- but I'll be using it for distance running and more general aerobic activity. This has all sorts of knock on effects on the biomechanics, so the prosthetists want to tinker with the alignment on a treadmill to make sure it's set up correctly. That'll take a morning -- and so will have to wait until after Christmas.

Secondly, my new walking leg.

The new limb will be something of a departure for me. Instead of the lock-in liner I use at the moment, we're experimenting with a new seal-in system.

Today, we carried out diagnostic checks and -- for reasons that are too boring to explain -- the new system feels substantially more comfortable than the old one.

So it'll be New Year -- New Legs.