Strikes me the only way the information is going to be obtained is if a coordinated effort (petition) is sent to L&Q demanding an answer. This has to be from the residents as my previous experience suggests that non residents will be ignored.
Senior managers at LQ can be found via linked in. I also have some email addresses used to get work done on adjoining house that caused a danger to us, can supply..
Personally I can't believe L&Q are not interested in development as the financial rewards from increased property density must be Tremendous? They have investors and with a combination of rented, shared and freehold properties the Shifford path site is a goldmine nicely done with open spaces and retained trees it could be a real asset.
I noticed that a recent eviction resulting from rental debts of £38k has resulted in the house up for sale at £370k so if the cost is £400k per plot plus build costs for say low rise apartments with 3 or 4 per plot at £400k looks like a good profit plus ongoing rental income and shared ownership. If I had millions would certainly take a punt