SPCR

I'm looking for a fanless laptop with eSATA. <=£400 is fine.

Don't ask why fanless. I want fanless. There are some Acer fanless laptops reasonably priced e.g. E11 or V11 but I don't think they have eSATA.

eSata is a standard that really never took off, you might have better luck searching for something older, as esata was used more back in the day when USB3 didnt took off, my old asus laptop had esata, but i it will be hard to find it fanless. eSata today.... you can find it in some SAGER/CLEVO laptops, but none of them are fanless, nor cheap.