Gas combi installed in kitchen above worktop. To give you some background, at the other end of the kitchen is a cupboard that housed hot water cylinders, now removed. One engineer, when quoting, said he would take a water feed from that cupboard and run pipes along back wall and up to boiler. The engineer I went with didn't advise how he would connect the boiler. He appears to have taken the water feed from the pipe that originally just served the washing machine. Is this okay? In addition he's used quite a lot of flexible piping, I'm assuming this is okay although maybe not gold/best practice? Tbh, as long as it's all fit for purpose I'm happy enough.