Spotted something useful for BBQ in Robert Dyas for £15; Heston probe meat thermometer that has nice long leads and alarms etc. you can set when it hits the temp you want. Has two probes and a split display so you can monitor two lumps of meat separately
They are also selling a domestic sous vide bath with a vacuum sealer for £130
http://www.robertdyas.co.uk/P~1475956~Buy-Giles-and-Posner-Sous-Vide-and-the-JML-Food-Sealer