Energy Action provide free insulation services to certain senior citizens and others. For example anybody drawing any state pension qualifies regardless of other means. I inquired on behalf of my mother months ago but never followed up on it thereafter. However in the past couple of weeks they unilaterally contacted her, came out to inspect the job (attic insulation) and said that they could do it (and fit draught proofing to any external doors that needed it) just as soon as the attic was cleared. I'm not sure how many people know about this service but I suspect that knowledge about it may not be that widespread.