BOAC
I disagree - LGW is a pretty simple airfield, and LHR has been greatly simplified with the new taxiway designators and getting rid of the block numbering system. In that, they are now pretty much like any other major international airport.
'Turn left on A hold short of J stand 123' - not exactly complex. Why does the UK think it is different to everywhere else? Yes the system is good but it is unnecessary,imho.