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Perhaps someone with your year car will confirm later, but it looks like it might be one of the fuses for the radiator fan. The under-bonnet box on my MY00 is roughly similar but not the same as yours. There are 2 fuses and 1 relay in that corner. One fuse is called 'main rad cooling fan' and the other 'sub rad cooling fan'. I expect the fan has a slow and fast speed, so you could lose one of those and not notice any problems when driving the car, especially in this cold.
Kevin
thanks for that, i was hoping it was for them, as i have been having trouble with the fans not coming on, so would this fuse being blown make the fans not come on at all, thanks phil.