This is thanks to the ECO scheme, which legally requires the main energy suppliers to install energy efficient tech into UK domestic households, including underfloor insulation.
Because this is a legal requirement, if the energy supplier falls short of their obligations they could face significant fines. As such, some energy providers are lowering the criteria for free loft insulation in order to meet their targets.
This means that many households around the UK are now able to receive free insulation measures. One of the only clear limitations on the scheme is that you must own the property or rent it and have the landlord’s permission to undertake the work.