Q.Tree hedge
I have a tree hedge all round my garden which seems to by dying off from the bottom up. Its is going very brown. I would like to save it as it provides shelter and also privacy from next doors garden. I have attached a photo so you can see what i mean. I would be very grateful for any advice.

There are a number of diseases, pests, and environmental/care conditions that can cause this. The following article explains some of the possible causes:
https://www.rhs.org.uk/Advice/profile?PID=132
Check your hedge for any visible pests, such as aphids or scale insects. Also, make sure you are not pruning the hedge too hard, since this can cause dieback.
https://www.rhs.org.uk/advice/profile?PID=352
https://www.bartlett.com/resources/Browning-of-Leylandii-Hedges.cfm