Thank you, yes we are going to apply for a permit, we were badly informed. It was a very stressful time as the old septic tank was leaking and we were under pressure from environmental health to sort it out. we approached a company to repair it and they informed us we didnt need a permit, we thought as it has been passed by building regs all was ok. Hopefully we will get a permit as we are set so low down from the road if not a very expensive error.