That service head looks funny because it is a looped service - that is to say that one cable comes in bringing supply and another goes out and onwards to feed the neighbours. Used to be common in terraces where the layout meant that fuseboards could be more or less back to back , halvng the cost of 2 supply cables in the days when low power (sometimes "lighting only") supplies were common. (and cable was more expensive than the labour to dig the trench)
Not normally done in new buildings now, though still seen in street lamps, as there have be cases of problems in one house setting fire to another, but there are plenty like this left in service
Given the black plastic design, inside it will be a BS88 fuse almost certainly, though the rating is anyone's guess. You could call YEDL and ask, or just assume less than 100A.
Clamps on lead cables are an area of concern, depending who put them on. There should be some linking the two lead jackets together fitted by the original installers, or maybe next door has no earthing.
I too have seen looped services on relatively modern (1980s) developments in YEDL (now Northern Power Grid) areas. Most of the lead sheathed services around here seem to have BS 951 clamps on them too - seemingly YE/YEDL/CE/NPG preferred them to hot working for quite a time and even now constant force springs are a rarity...
Yes you do see them now and again, the back to back linking and also the BS951, in fact the old YEB used a clamp that IMHO was inferior to a BS951 but they were common, personally I like to see the the sweated solder bulb that Norweb did although their earthing conductor itself was more like a piece of wet string. As I straddle both areas I`m used to seeing them (When I say straddle I don`t mean me physically - some may say I do though, but I mean my working area is close to the border of the two old Electric Boards as they were called back in the day)
