What used MG HS hatchback will I get for my budget?
As of writing, around £16,000 to £18,000 will get you into a 2019 or 2020 HS with low to average mileage. Cars in this price range will be in Excite trim and have the non-PHEV engine. Nearly-new 2021 models in Exclusive trim go for around £22,000.
For a PHEV, expect to spend around £26,000 at least for a 2020 or 2021 Excite car with minimal mileage.