Buyer asking me to change address after purchase on eBay ? What to do please ?

Having another problem now on eBay it's non stop dam it .

Sold an item for a 100£

Buyer asking me to change the address after purchase

Seems very dodgy? Any advice please.
how do I deal with this without getting bad feedback if it's a scammer which I suspect



Official check out address is London,, completely different address, advice please?