Final answer:
The UK decided to allow for regional governments in Scotland, Wales, and Northern Ireland due to devolutionary forces, cultural differences, and nationalist movements.
Step-by-step explanation:
The UK decided to allow for regional governments in Scotland, Wales, and Northern Ireland due to the presence of devolutionary forces and cultural differences. Scotland, Wales, and Northern Ireland have their own local parliaments to govern local affairs and retain local heritage.
Scotland's desire for self-rule without isolating itself from the larger regional community influenced the decision to create its own parliament. Similarly, Welsh nationalism and the need for local autonomy prompted the declaration of a separate parliament in Wales. The presence of separatist movements in all three regions also played a role in allowing for regional governments.