Just found out parents have invited back a surveyor tomorrow who called last week without an appointment as apparently they can get "free cavity wall insulation". They are not entitled to any benefits or tax credits so I was wondering if this is actually the case? Has anyone had this done and found it was exactly what it said on the tin? The firm is called 'niceenergypeople.co.uk' they appear to be based in Brighton but Parents are in Essex. Would hate for this to be a scam/ sort of deal with hidden costs. Can anyone shed any light or share experiences with the same firm? Thanks ever so!