We thought a like for like replacement of a 14 year old poly carb, now leaking, conservatory roof would be sufficient and were quoted a reasonable price. Brian explained there may be a better, more efficient heat retention/cooling roofing system to reduce winter heat loss and reduce summer heat. Cost difference was not a bonkers figure but much more than original replacement. No 10 score for quality yet as the roof is only 3 days old but so far everything Brian advised is good as the conservatory is so much warmer and better. We're glad we took his advice and would recommend his firm.