I'd forgotten how much hard work rewiring can be although this was strictly speaking a partial one, just the original house which had a single very dodgy rubber twin for all the lighting and a slightly larger and equally dodgy rubber twin [with a separate bare stranded tinned copper earth !] feeding umpteen sockets via loads of underfloor JBs and on a 30amp rewirable fuse. The rear kitchen and bathroom extension all done in PVC T&E tested out fine thankfully and was reconnected. TNS supply with a Ze of 0.2 ohms, very good- old lead sheathed cable though. Everything went really well and the customer is very happy. Here's a pic of the Hager board I did today, no RFCs at all.