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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@LawrenceG
MetallixBrother a few questions about warehouse is chilled and is full of metal racking?
Looks like your in the UK so a RF module in the 868 mhz band would be my choice (http://www.lprs.co.uk/). You can use 433 mhz but that can have issues for ham radio & others RF channels. As I'm sure you know lower frequency better the range in buildings.
Also look for modules that provide RSSI (Receive signal strength Indication) in their API. This will let you know how well you are connected to your temp sensors and log battery voltage. Both of these will help you run a robust wireless sensor network
As for your Raspberry PI solution, that's exactly what I use but run Nodred.org as it has all I need. I've just started using it with Espruino.