Things have well and truly gone to the dogs in UK PLC, but just to post again below a copy of something I put in another topic in case not seen - it's all a bit of scare mongering really and won't affect the vast majority of people:
And on the tax issue worth checking out the 'official' HMRC guidance here:
Find out if you need to declare income from selling personal possessions, goods or services online, creating online content or renting out property using digital platforms.
www.gov.uk
And visit here and select 'sold goods or services':
www.tax.service.gov.uk
"You do not need to pay tax on personal possessions you sold for less than £6,000."
And that does not includes cars nor does the below!
However:
"If you sold a personal possession for £6,000 or more, and made a profit, you need to tell us about this income. This is because you may have to pay Capital Gains Tax on the profit you made."
You don't need to worry really unless you're 'trading' (ie buying or making items to sell on) or selling very big value items. As ever HMRC like to put the frighteners on Joe Public.