Knowing your personal view of Brown's incompetence I cannot imagine things are going to go well for Labour under Brown's leadership and your penmanship
Brown had a fair few ideas he'll want to get stuck into which were put on the back burner in 2007 due to the financial disaster. He also won't have the time to iron out all the bugs with the first Brown cabinet (which to put it kindly had a few bumps in it).
My recommendations: go to the country in a general election now, iron out all the bugs after if he wins, introduce the most important Brown reforms* once things settle down, and the respond to the economic crisis the same as OTL (which was one of the few things Brown did absolutely right).
* Work on NEETS who are young people Not in Education, Employment, or Training. There was much discussion of an overhaul on education qualifications and apprenticeships and helping people out of long term unemployment.
Work on welfare reform which Labour finally got round to at the end would certainly be started earlier.
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Overall I'm loving the humour and style! Keep it up! And remember; Brown wasn't
that incompetent, just mildly so.