Spoke to Southern Electric yesterday about the same subject. An engineer asked why I wanted it, told him I was going to have my CUs replaced. His reply was to have my electrician pull the fuse himself. Then, when the work was completed I should notify SE and the next time an engineer was in the area he would fit a new seal.
I find it hard to believe that they say pull the fuse yourself. I work in the streetlighting industry and you need to be suitably authorised (similar to G39) to pull fuses (even 25amp s/l cutouts). The use of rubber gloves, covered limbs and visors are a must.
it's a classic case of what the beurocracts would like to belive happens and what is tolerated and even encouraged by people on the ground being totally different.
Though I did hear from an electrician on another forum that the local DNO got rather upset when someone removed the service cable from the bottom of the cutout rather than the tails from the top causing rather a bang.
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