Hi, looking for a bit of advice. I employed an Architectural Technician to do the plans for planning permission, and then to help with building control, though he said he doesn't do drainage. I have got everything sorted now with the exception of the build over agreement with Thames Water. I spoke to Thames Water and they said that they only have a combined sewer in our road, and didn't require anything else to be put in. But the council wanted a SUDs system. Therefore we are going to get a Rainwater harvesting tank for Storm surge that then has an ultra low discharge back into the drainage system. The council have signed this off for our planning condition. Sadly a Soakaway is not an option as the ground is clay. I basically need someone that can help with the build-over agreement and at the same time do drawings for the ground-workers to use for construction. It requires a pump, calculations have been done by the people providing the pump, but I still need someone that knows where we should run the drainage and how we can connect to the sewer, as the invert level is 3 metres underground. Any advice greatly appreciated.