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The budget is delivered by the Chancellor of the Exchequer (not the Prime Minister), currently RIshi Sunak. Sajid Javid and Philip Hammond were the 2 Chancellors that came immediately before Mr Sunak, with Sajid Javid leaving in a storm of controversy on 13 February 2020.
Explanation
Whilst Carole King did write "Pleasant Valley Sunday" for the Monkees, she didn't write the theme.
Elgar featured from 1999 to 2010, and Adam Smith was introduced in 2007 and still features on "old" notes. The new notes feature J.M.W. Turner, and were introduced on 20 February 2020.