Been away - so only just caught up with this thread.
43096 may seem to be a little sarcastic in his approach - but he is right on the button.
There are several problems with HST preservation:
1) The cost of preserving power car(s) and trailers
2) The man power required to preserve power car(s) and trailers
3) The physical space for preserving power car(s) and trailers
4) Finding somewhere to keep power car(s) and trailers
5) The (limited) ability to operate power car(s) and trailers on preserved lines
6) all of the above x 10 if you are hoping to go mainline.
125 Group has made a fantastic start by teaming up to take an NRM static asset and spend the time, effort and money to make it operational. It has achieved this at not insignificant cost, but with a huge amount of industry goodwill and support - which is less likely to be forthcoming in the future on production vehicles.
They have then, of their own initiative, secured three Mark III trailers to make a mini prototype HST - not original - but a good representation - and secure the funding to get them liveried to match 41001 - and they are turning heads at Galas!
Future HST preservation could be so much to so many - and where do you start and finish? Main line sets would be lovely but the cost will be enormous. A couple of power cars is doable, and the spares are there to support some restoration to near original. A couple more coaches would be lovely so that you can have a mini HST set on preserved lines with either a pair of production cars - or one production and one prototype - don't worry about the electrics - the different cars can feed their respective vehicles quite happily. But even this is going to cost some considerable dosh not only to acquire, but to maintain.
125 Group is doing things right, but will need huge support if they are to see continued HST operation after the main fleets are withdrawn. No surprise they have started a concerted fund raising - and they will need every penny they can get (unashamed plug -
http://www.125group.org.uk/donate/ )
Oh - and did I mention the cost?