My dad thoght it would be a good idea to modernise his house before he sold it and when it came to the sale they wanted every certificate under the sun gas, bolier, electricity, windows, ect ect and if you dont produce them you need imdemnity at further cost he would have been better off not modernising and sold it as a wreck for someone else to pick up the peices. This country's gone certificate mad but on topic I bel;eive it is much harder as a seller than it is as a buyer now and much more stressful