I have just completed a job and installed a new fused main switch upfront of the tails.
Three fuses were supplied 60, 80 and 100 amps all IEC60269 and I have installed the 80 amp fuse.
All done, however I am now looking on pages 356-358 of The Wiring Regulations BS7671 and surprise, surprise, I cannot find them listed. Issue or no issue?
IEC 60269 - Wikipedia
Andy B.