its not the sockets per se. Its the fuse in the fuse box that will blow if you try to run too many things at once. I have got 20 sockets in my kitchen plus the fridge freezer, cooker, washing machine, boiler and dishwasher, but when the kitchen was fitted, this was taken into account when the sockets were wired in. Its when further sockets are added after the kitchen is set up, or when plug in multi sockets are used as well as all the other sockets and everything is switched on at once.