Remove them from the little block and connect them to the earth teminal on the switch plate or run a fly lead from the little block to the earth teminal on the switch plate
I'm not sure they do battery powered with wired interconnect, but they do mains powered with wired interconnect and battery powered with wireless interconnect
Their behaviour (being annoying) sounds more like wasps than bumbles. I suspect most beekeepers won't be interested in or have expereience of dealing with bumbles. If it was me I would live with them as their season is relatively short, but there is some sound advice if you do need to move them...
Cut 21k police, recruit 20k police, leaves you with 1000 less police from where you started - think the maths lessons Sunak wants to increase need to start in CCHQ
Look up span tables for flat roofs. prob looking at min 195 x 47 C16 @ 400mm.
Easiest way to get the fall is probably to add furring strip (a diagnally cut timber) on top of the joist to give you the required fall
In a similar boat - identify existing insulation and where this could sensibly be upgraded. Then do heat loss calcs before purchasing a heatpump that can handle the requirements, and upgrade any radiators that require it
Airborne noise you really want to add mass - e.g. double layer plasterboard or acoustic board
Windows will likely be a weak point - check seals, and though not cheap consider acoustic glazing
Don't overlook the ceiling, as I noticed this was a big source of noise on a recent renovation
I'm planning the warm battern method (PIR, battens, PB), you lose more floor area, but this does mean you can foam and tape joints in PIR and gives a useful void for services