Thanks for the Tip Andy, for me the issue did come down to an upgrade of the TradeMe App, I thought it would auto update, but manually updating the app now shows me the the items I lost that were on my watchlist. Would of been good if that was the original recommendation from the TradeMe responses or even added to the support/help documentation. Doesn't work....update the app on your device?.

I can confirm this 'bug' still exists, unless its by design and trademe no longer want you to be able to view a finished auction you missed out on which would be good to be outlined in their documentation