For the last six years we have tested a five pitch caravan park on a farm. First year I rewired between all the meters and switchgear because the Caravan Club rightly condemned it, see pics of my efforts. Only two of the original rcds have been replaced since. This week one of the pitched caravans had an annual health check and whilst the fella was at it he tested the socket and passed the owner a failed mains test report saying there was no earth and dangerous voltage between neutral/earth. I pop in this afternoon as you never know and all tests out fine, rod, rcd, continuity etc... What is going on with people he was an electrician, apparently.