Why would my shower have 2 supplies

[7671]

Planning my consumer unit change ready for my assessment in a couple of weeks. Looking at the board - and note i've not investigated any further i seem to have 2 40amp CB's labelled Shower front and shower back. Both are rated 40amps. Now i only have one shower and i cant see there ever being a shower in the front of the house anyway so im not sure if the labelling Front and back refer to the actual location

Is there any reason why a shower with pull cord isolator would be wired with 2 supplies ?

 

[uksrevivor]

My post was supposed to quote the OPs post #13 below

Like I said earlier in thread, I will take a look as anyone would in this situation. Let's be honest technically any domestic electrical work or commercial for that matter isn't really that difficult. Working out what others have done in the past is