If you were Prime Minister...

[NorthernRaider]

oops forgot
Because water is essential to human life I would nationalise the water industry and make domestic water supplies / sewage free all home owners.
Raise the penalty for dog poo dumping and stray cats to a minimum of £5000 per offence, so if you dont clean up your dog muck, or you let your cat roam its £5000 fine and it will be paid all at once even it its out of pensions or benefits

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If Scotland democratically chose to leave the union I would require all Scots to leave England and Wales as we would only be restating the pre 1707 laws, Full border control would be applied as with all European countries, and transit tarrifs would be applied to all commercial traffic passing through the UK to Scotland