Precedent exists for lower easily however GBPCHF and GBPEUR trade at or below first ever recorded prices in 66 years.
Why GBPJPY approaches historic lows is because GBPUSD and GBPJPY are the same currency pair, always Correlates together extremely high and trades together as solid brothers, a marriage since the 1930’s under the 1930’s gold standard.
Yet another failed BOJ experiment as is their 100 year standard practice.
GBPJPY major break Point for higher is located at fast falling line at 137.14. Above Targets its longer term target at 147.00’s.