Return needed to declare amounts received from selling multiple personal items (non-trading)?

Hello Over the last 20 years or so I built up a rather large personal collection of CDs and vintage band t-shirts Due to a change in lifestyle and a need to generate some extra cash for the family, I sold these in batches as group lots on eBay over a 2 year period. In addition, I sold some other personal possessions such as books, a painting and other small items. In the tax year 23/24, this equated to around 350 items sold for a total of around £10k. It is hard to see exactly the final amounts which I received after eBay fees, postage costs etc. I do not consider myself to be trading in selling these items - none of these items were purchased for sale, but all came from my personal collection which I had built up over many years. Many of the items sold (of which 90% were CDs) were sold at a loss, given that the were purchased at £10-£15 each 10+ years ago and sold for an average of £6-£7 each. I am a higher rate taxpayer and all of my other income tax is paid through PAYE. My question is - am I correct that I don't need to complete a self-assessment in the circumstances? I have no untaxed income (and again, don't believe the amounts raised through these sales are taxable). Having merely sold personal items here (albeit a pretty high number of them), it doesn't seem right to me that I should have to pay 40% tax on the amounts generated as income. I am conscious that eBay and other platforms send sales data to HMRC and the volumes and amounts here would likely flag up as looking like trading income, even though I don't believe that it is such in the circumstances. Any guidance would be gratefully received. Thanks

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