I am pleased to inform you that I have managed to use one of the pieces of fabric that came home with me from London, a scrap of lovely suiting type fabric that I picked up in the swap. I don't know who donated it to the swap, but whoever you are - thank you! I love it!! (Please own up if it was you!)
As soon as I saw this fabric (which was a little less than a metre, plus a bit due to the cutting done by the previous owner) I knew that it just needed to become a pair of thurlow shorts. And I was incredibly happy when I managed to fit all the pattern pieces onto the fabric with very little difficulty:

I didn't make any further alterations to the pattern, as per the pair I made for the pattern testing these are a straight size 10, with a 6cm increase in length to make the cuffed version the same length as the uncuffed version. I had marked on how far in I'd taken the centre back seam last time, so I just cut that out ready to go as I knew the other pair are spot on in fit (which saved a little fabric). The only difference between this pair and my first pair is the addition of the back pocket facing that is in the final pattern but wasn't in the pattern testing version (the only tissue piece in the above picture!).
I managed to find some solid brown fabric in my stash to use for the pockets and facings that matches the dark brown fibres in the weave of the fabric, I had a button and slide in my stash to use, and cut down a larger zip to size, so that I could make the whole thing from the stash, which was good!
Another quick thing, the t-shirt that I'm wearing in these photos is one of the many t-shirts I've made and haven't blogged. This particular one is made from some absolutely lovely merino jersey that I got at The Fabric Store. I love my merino t-shirts so much, they're great in cold weather, great in warm weather, and they get less smelly. Win, win, win really.
(PS: Thanks to Mel for snapping these photos for me)