Nah that will just blow the fuse - how boring! You need to make the following*...
(Don't do this, it is a very very bad and unsafe thing to do, it is posted merely for amusement purposes)
Take an 8 way extension lead plug it into a socket in the kitchen (but don't turn it on - safety first!) now make a cable with a 13A plug on each end plug one end into the 8 way extension plug the other end into a socket in your living room (but don't turn it on - safety first!) Now make another cable like the last one, plug one end into the 8 way extension and the other end into a socket upstairs (but don't turn it on - safety first!) Now make another, plug one end into the 8 way extension, and the other into another socket in the Kitchen (but don't turn it on - safety first!) Now connect 4 separate cables to the shower, and terminate them all in a 13A plug plug them all into the 8 way extension lead turn on all the sockets (kitchen, upstairs and living room, them you can use the shower!
*If you have three phase in the house, you will probably kill yourself or burn the house down faster than if you do not.
If you do this, then you are a mad fool who must be suicidal, and I take no responsibility for you!!