Yes, I tried with the fuse puller but no dice. Rang up my mechanic to order a new fuse and ran it past him, he reckons that there are 2 screws or bolts either underneath or on the side that you have to undo before you can release it. I've chickened out as there are lots of wires etc going to the fuse box and it would be just my luck to pull something else out by mistake

The fuse will be in on Monday and he said he'd pop over and sort it for me
Thanks for your help, has made me feel way less stressed. Now all I have to do is figure out how the tow hitch and PTO drive work on the new tractor and I'll be organised