TSR2, you're wrong in what you say about the advertised price. Any advertised fare must be available to buy according to the ASA. Therefore if you cannot buy the fare for the advertised price, this is not allowed. When Ryanair say you can buy a seat for £1, you can.
As far as I know, Jet 2 is the only airline currently flouting these rules by having completely unavoidable charges that get added on during the process.
All the other Locos have a way of avoiding any additional charges even if it is quite difficult!