to apply - I just use one of those kitchen sponges with the green scourer on one side (use the sponge not the scourer)
one sponge will last at least 3 or 4 applications ie 12 - 16 tyres (on average)
Electric wise - Building regs have standards on heights for sockets and light switches (in new build houses) not extensions and alterations
IEE regs would apply in this instance - make sure the guy altering the elecs is NICEIC or ECA registered - it will say in the IEE regs where those spurred switches must be placed (and I suspect they must be above the cupboard - there will probably be a height - I'm not an electrician so couldn't possibly comment )
Alternatively the person altering the electrics must be on the Competant Persons Register http://www.competentperson.co.uk/