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For more on marking an answer as the "Best Answer", please visit our FAQ.jedimistress, You would be well advised to apply a cleansing agent ( as manufactured by Fernox, or Sentinel ) to your system when re-filling. Application instructions will be supplied with the product.
Also, inspect the system thoroughly as it is filling, just in case of any possible leaks.
You could just fill the system without the above, but after a period of over a year there could be scale in the radiators, which could find its way into the boiler, causing problems.
Thanks. I called out a Heating Engineer who gave me quote I died at. I called out a couple more since to try to beat his quotes. They already knocked �200 off without even looking. (Like for like, not cheaper brands of boilers) The engineer said I need a new part but he would recomend a new boiler in case there were more problems than just the part.