If you get a spark in then he or she will probably recommend a CU change but you dont have to do it. As long as the board complied when it was fitted then it doesnt need to be changed. They might check over things like earth cabling and bonding and see if it meets current requirements. Depending on what size of cable your spur is wired in you could easily pull full load through two sockets if its a twin socket. You would only be limited to around 13amps if it is connected to a 13amp fused spur. Its been a while since I did any real electrical work but a bit of 30Amp fuse wire will happily run at over 30amps for quite a while without blowing.