Over a year ago, I had a builder in to do some renovation work (they did about 6 weeks work and finished up around the end of Nov 09) Towards the end of the work, I asked him for a final bill - there was some extra work added from the original quote - he told me he'd drop it in a few weeks later. At the start of last year, I chased him a few times and he kept promising me that he'd drop in the bill but never did. It's over 8 months since I've had any contact from him.
Are there any rules and regulations as to when you have to supply an invoice for work completed? Is there any obligation on me to chase this invoice? Should I keep money available to pay him?