Having had three parliaments (that of England, Scotland and Ireland) reduce to two parliaments (that of Great Britain and Ireland) in 1707, then a single parliament (that of the United Kingdom), in 1801, I think we can thank the Irish for ending up where we are today.
The creation of the Government of Northern Ireland in 1922 meant that, for the following half-century, two administrations existed within the UK; something which had never happened previously. Only from 1972 to 1999 did a single entity exist in the form of the UK Parliament at Westminster; something which had been the norm between 1801 and 1922.
However, since 1999, the Northern Ireland Assembly, National Assembly for Wales and Scottish Parliament have left those in England feeling, rightly, disenfranchised. Perhaps a federal approach to government within the UK is the only means of preventing a system, blatantly unfair to those in England, from imminent collapse.
After all, recent polls have indicated a greater % of those in England are in favour of Scotland leaving the UK than remaining - surprisingly, the reverse being true in Scotland.