Flat to rent : made an offer at advertised price, but now the landlord is asking for more money

Hi,

I made an offer for a flat to rent in London at advertised price, but now the landlord, after revisiting the place, is asking for more money than advertised.
Nothing was mentioned during the visit or when we first made our offer.

Is that allowed ? Do they have to repost the add with increased price ?

Thanks

Marie

Hi Marie, did you place a holding deposit when you made your offer?

Sam