As soon as Scottish and English MPs began negotiations for Union in 1706 there was a debate about the two options - an ‘incorporating’ or ‘federal’ Union. The following arguments were made for an incorporating Union.
Incorporating meant there would be a shared Parliament. This would avoid disagreements between separate governments in Edinburgh and London.
It would mean a reduced threat of foreign invasion and there would be better protection of trade by the Royal Navy.
Scottish negotiators for Union knew that England would only accept incorporating union.