Yes, I know, my neighbour has one, but this discussion is about heating very large rambling buildings like the H of P, and biomass will only be effective (and already is) in rural areas where the surrounding land can provide most of the wood chip needed.
The amount of woodchips needed to service sufficient boilers to cope with big urban buildings like the the HofP would be logistically extremely difficult, and require a large area for storage and numerous deliveries.
When we talk domestic biomass the biomass boilers are considerably bigger than the standard gas or electic boiler, usually requiring a separate room of their own and there needs to be space to store the regular deliveryof sacks of woodchip.
I note that when the people who installed it - and had enough garden and storage to deal with the logistics, moved house, they went to a house with gas central heating, and have not changed it, even though their new house had all the space for a biomass system. I also think the family who bought their house replaced the biomass boiler with a gas boiler. I haven't seen any deliveries of wood chip for several years, whereas once they were a regular sight.