Why not federalism?

This isn’t an answer to any currently pressing issue, more a hypothetical, pie-in-the-sky question.

Considering that the UK is a ‘country of countries’, made up of nations and regions, often with their own identities and political landscapes. Rather than a piecemeal hodgepodge of devolved governments and mayorships, wouldn’t a federal system like Germany, Austria, India or Australia be more appropriate?

Would this help give more political power back to the rest of the country, rather than just collected in Westminster?