Aldi will have these Homeywell document safes instore from Sunday 09/03/14 for £34.99, it comes with a 3 year warranty as well so I thought this was quite reasonable.
Product Information :-
Keep important documents safe and protected.
Fire protection for up to 30 minutes at a maximum of 840°C
Inner volume: approx. 7.3 litres
Safety latch with 2 keys