can I approach a seller that's item didn't sell and make an offer?

[brimfull]

meant to bid on it ,but forgot and can see that it's ended and noone made a bid?
Am I allowed to send the seller a message?

you can say 'can you let me know if you will be relisting as I missed the end of auction?' kind of thing. Then its up to them to respond however they see fit, as they'll then have your email address...

ok great ! thanks

Was it anything interesting?

A skirt ,quite dull really.No more details you might bid on it!

I have done, got a very nice cabin bed much cheaper.

I've done it too.

Message withdrawn

I have listed something with a buy it now price when I have been approached after the auction. This way you can bid straight away and win the item officially. Good luck!!