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I DIY'd this too, though did it whilst renovating before we moved in to the house after buying it.
Did all of downstairs, about 50sqm, and it took about a day (boards already lifted; not including nailing them back down). Wasn't quite as neat looking as Ed's photos, I must admit, but we've never felt any draughts nor notable coldness in the floor, which is/was always naturally quite gappy (might buy and install draughtex at some point, but more for aesthetics).Materials-wise it was probs only a couple of hundred quid - screwfix roofing membrane; cheapo rockwool alternative; screwfix DPM; staples.
Cheers for the photos @edscoble and info. How many rooms did you do and did you do it yourself or does that cost also include labour ? 5k seems quite a lot! I’ve been looking at ragg wool vs celotex, both look pretty straightforward and I would do all the labour myself. Ragg wool seems like it would be quite a bit cheaper