Put down some weedmat first, and a bit of sand/rock to hold it in place. Also set in some crossbracing (probably redundant with all the joists being fixed in, but whatever) and the joists are held in with triplegrips at 400mm centres.
Got the first 10 or so joists fixed in, and will get the rest done probably tomorrow - need to trim them to fit in around the brick pier first.
And then more internal framing to do so the picture border can go in.
Pretty annoyed with how one dodgy ebay seller is holding up progress though.
*EDIT* Turnes out the delay was due to the courier company managing to lose a parcel in the 10km between the seller and myself. Even so, if a seller isn't going to be working for a certain period, they shouldn't be advertising items for sale if they're not going to post them for a week. *