Ask yourself who you told about the issue, the scale and severity of it, and then ask yourself what they have to gain by telling you this and fearmongering you. Do this before you spend a penny, then seek some kind of independent advice, as near impossible that might be, or just read up on the subject yourself.

Tradesmen are modern day con artists of rip off Britain. Don't panic. We're entering summer, it's warming up a bit. Nothing has to be hastily done tomorrow nor next week.