Hooligan, 1000hrs is not the limit for guys looking to get into the airlines, do not know where you got that from...
WWW is wrong on this I am afraid, there is no hours limit to anyone instructing in the UK, unless they also have a job where they fly under an AOC, then the hours WWW mentioned come into play. The problem of quality is more the issue here, around 5/5 hours per day should be the max to ensure proper pre-flight brief and de-brief/next lesson prep.