Mummified live fly

We were in the kitchen an hour ago and heard a buzzing and saw this spider having just trapped the fly in its web. So we watched as it started winding its silk round it with its legs and I put a single extension tube on the lens, my better half held up the torch as the light wasn't all that good in the corner, and I took several photos as the spider was busy spinning round the fly which was still alive and buzzing furiously! So it's not as clear as it could be because I shot it at 1/60 and the spider was working furiously.
Voilà, nature at work and the first time I've ever seen a spider doing that.