In spirit, your workplace pension or personal pension is the closest thing to a 401k. A SIPP is a personal pension you control. When you hear 401k think work place pension or SIPP (Self Invested Personal Pension)
A Roth IRA is most similar to an ISA in that withdrawals are tax‑free, though the rules and contributions are not identical. For official UK guidance on ISAs and pension tax relief, see GOV.UK.

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