I you use the Dahua pentabrid DVR (Amazon.co.uk: Buying Choices: Universal Hybrid 5in1! DAHUA XVR4104С 4 Channel Pentabrid HCVR WiFi NVR DVR for HDCVI, AHD, HDTVI, IP, CVBS (Analog) Cameras) This is the only one I can find in the UK. Do you need to install a HD if you only use it to connect to BI ?