I'd second the Passat 4motion TDI Estate. Way cheaper than the Audi Allroad, bigger boot than a focus estate, superb engine - get the 1.9TDI 130 rather than the 2.0 in my opinion anyway its better, galvanised chassis to prevent rust, pulls really well. I always got over 30mpg when fully laden with 5.8mtr rib plus full load of dive kit, 45mpg+ when not towing. Getting hard to find low mileage examples now though.
Finally avoid the Sport version - it has 25mm lowered suspension which makes it useless for towing on anything other than flat surfaces!