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Want to know more about what's required etc
You can pay someone to do it like an accountant or you can do it yourself.
Either way, you'll be responsible for it and accountable for what you are telling them.
Unless you have exotic investments, i.e. property, shit load of bitcoins etc then it's unlikely an accountant would add much to the mechanics of it. An IFA would try to wrap your investments in tax free wrappers too so you might find there's little income thats taxable beyond your salary.
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The latest FT Money podcast may be of interest to you: "FT Money digital editor Lucy Warwick-Ching and guests discuss when people should pay for advice and how best to get it. The show delves into the different levels of advice available and how to choose the adviser best suited to you."
https://www.ft.com/content/3b5e659a-9b09-4189-81a3-b54e6408b6cf
don't all pensions get registered under your national insurance number, via paye
surely hmrc could organise a search under NI no.