Thank you all for your input, I appreciate it.

I have tried the "soft edit" option in the bulk editor a few times, but that hasn't made any difference.

I've also tweaked some of the titles and gone through everything to make sure the listings are optimised for search via their specifics.

I've put a few more things on sale and offered free postage to more items (although the vast majority of my buyers do NOT buy these items - 95% of my sales are with buyers happy to pay postage).

I'm also diversifying again into a couple of new items/range and we'll see how those go.

I will get ask CS to give me a call back on Monday and see if they have anything valuable to contribute (not holding my breath though)

I might even lower the subscription again to the Basic shop. After all there doesn't seem much point in paying $60+ a month if I'm not getting much value out of it.

The other thing is that I have an older Ebay ID which I haven't used for more than 5 years. On that account I get the 40 free listings a month, so I might start transferring some items over to that account and see what happens. If there is something weird going on with this store, it might come in useful to bulk up another ID and see if those items start selling.