You can if you isolate the flow and return to the radiators first, otherwise the boiler will loose its pressure when you drain them and won't work. You will of course have to leave the cold main supply on too.
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.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local