Our downstairs loo stopped flushing the previous week and after a quick email request on Sunday, I was contacted by Sonata at Ainsdale Gas on the Monday morning by phone and the plumber (Simon) was at the house half an hour later. He confirmed that a new siphon was needed and went off to get the new part, returning 15 minutes later. The replacement was fitted quickly and without causing any undue mess, and the whole job was completed in about an hour. Excellent work by both Simon and the company.