The only OW airline operating to SKP is QR from DOH. For non low cost carrier airlines in to SKP, transit points are ZAG (OU), VIE (OS), IST (TK), ATH (A3), BEG (JU). As you can see...it has decent *A coverage!
Obviously there is service on Wizz from LTN-SKP (not daily though), but coming from the south coast I guess you'd be as well forgetting about that.