As we advised, we have had to make some radical changes to our billing to fix database load issues. These have gone quite well overall, but there have been a few snags. We think we have them all now, but this month we had to revert some usage charging giving some free usage. We have identified that quarterly billed customers on units tariffs were not charged, so these are being applied shortly as a new invoice. Anyone with excess usage as a result, please do ask accounts for a credit. We have also identified that call charges have not been billed - these can be billed to date if anyone asks, or if you leave it then they should finally catch up on next month's bill. Sorry for any inconvenience.