Sin taxes up - smoking, vapes, alcohol.
Possibly petrol/road taxes up "to encourage a move away from carbon"
Property taxes up - a higher council tax band for houses worth more than, say £1m. Double/triple council tax for those with second homes that aren't rented out. Stamp duty up at the higher end, but possibly reduced at the lower end to encourage first time buyers.
A reduction in the amount that people can get tax relief on for pension contributions (from £60k to say £40k).
A reduction in the amount that people can put into ISAs from £20k pa to £10k pa.
National Insurance charged on some income streams that are current loopholes (e.g. limited liability partnerships, self-employed contractors, TRONC). More controversially would be if NI was charged on people working past state-pension age.
A quicker increase to the state pension age than what is currently expected.
Tightening of some benefit eligibility to reduce the numbers of people claiming.
"Efficiency savings" i.e. reducing workers in the public sector. Investing in AI so they can sack people.