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@meinblack2010 wrote:
After a few weeks of not putting anything on ebay because of "simple
delivery" I decided to list a item which I have sold in the past and I Know
costs £4.05 48 hour tracked royal mail..... They advised a delivery cost of
£3.38 but when list it changed to £2.58 or something.... Not happening
ebay.. Sorry

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It's possible that the lower price that you saw was the amount excluding VAT (although that would be £2.82 not £2.58).  It does take a few minutes for the VAT to be applied when listing.

£4.05 is the 'over the counter' price for Royal Mail Tracked 48 and £3.38 is the price for the same service with Simple Delivery.  You won't need to pay any extra, just use the label supplied by eBay.