Would love to do drawing to illustrate this but this is ChrisR's forte and he may think i'm upstaging him
not got money to burn, that's 4 pints!!
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local