Well Matt came as we had our old back boiler removed and a new combi boiler fitted, Radiators were not getting hot downstairs for at least 45 minutes, Matt done his work and informed me of an issue that we should fix, system cleaned and a filter fitted, sludge removed system balanced and now downstairs only takes 10 minutes to heat up, I would use Matt again and would recommend, yes there are some cheaper power flush options, this has sorted out our heating, Matt very professional.