Are wooden platforms really a fire hazard? I mean, I can understand wood being a problem in a dry confined space (LU escalators, for example), but out in the 'damp' UK weather, with easy ways to evacuate? I'd have thought it'd take a LOT of effort to set a modern wooden platform alight, even deliberately. Certainly CCTV cameras would pick up any attempts pretty quickly.
I'm going back to 2002 or 2003 (I don't live there any more) but many of the new platforms I used around the Manchester suburbs were wooden. For sure, my regular commute from Flowery Field was. Also Godley on that same line. Basically most new stations of the 80s and early 90s.
If you asked me to guess how many there are on the network, I'd guess several hundred. I'd say it's a perfectly sensible, safe, cost effective solution really.
Now, what I never understand (totally off topic) is how a certain country (with an overgrown Wotsit in charge) build all-wooden houses in either tornado zones or forest fire zones then wonder why so many whole neighbourhoods either go up in smoke or get blown away.