Correct answer is 2 fold
BS 7671-2008 there is no 300mm value for sockets being away from a sink in a kitchen. There use to be in the 16th or could even have been the 15th, time fades the memory, but it as been omitted. There is no 300mm values in either section 553 Accessories or anywhere in chapter 5
In all the Guides associated to buildings and regulations it does recommend that you try and keep that distance, but unless there is some manufacturer or design reason behind the limit, then these are guides and so open to interpretation