Yep, it was a worthwhile trip. I found I what I wanted (Jurassic Park Trilogy Steel boxset) and because it had gone down in price, I was able to get The Eagle as well for £1 - because that had also dropped in price - the voucher itself was for £10. Felt a bit sluggish on the run itself, but I think that was probably because I left straight after eating - note to self: that doesn't really work well.
I didn't eat much though. 
It was fun though, it felt like a mini solo marathon. 
I want to strengthen my legs, so am going to add a hill running session to my routine. So it'll probably go something like: 'ordinary' run (around 5k) hill session (around 6 or 7k) and maybe a 10k to finish at the weekend. 
Edit: Well, the run might have felt a bit sluggish, but according to MapMyRun, I did it at an average pace of 05:54 (miles per minute I suppose?) That's faster than I've gone before.
Edited: 03/01/2013 at 18:40