Questions about collections and price negotiation

[EldonAve]

I have sold a buggy and a highchair, both for collection

If people try to reduce the price on seeing the goods how do I adjust that on ebay?

I don't want to pay final value fees on the full amount if they want a few quid off

If they've bid, then there is no reason for them to pay you less for the items. On what grounds could they negotiate?

If they refuse to pay what they have bid, you should not allow pick-up, and claim them as non-paying buyer. A hassle I know.
If they want to pay less- warn them that this is what will happen.

Yup, you bid to buy not bid to come and have a look and haggle!

if they try to reduce you tell them to sling their hook. and NPB them.

only reduce if they notice a problem with the item that was not mentioned on the listing.

Thanks for the advice

Items were just listed as used but in full working order so hopefully they won't try to haggle
I just like to be prepared!