The Blue Flue is one of the Priam class and the ship in the background looks like it might belong to Flota Mercante Grancolumbiana S.A. which was, and maybe still is, the Columbian national shipping company. Their ships' names generally began 'Ciudad de'followed by the name of a city or town, eg "Ciudad de Bogota".
She's not the Priam or Peisander-wrong cranes. Could also be the former Glen boats Phrontis (ex-Pembrokeshire) Perseus (ex-Radnorshire) Patrocolus (ex-Glenalmond) or Phemius (ex-Glenfinlas) These were big, fast ships and the end of the break bulk era, as shortly after they were built the Box boats really took over. I have some wonderful memories of the Perseus during my cadetship.
I think Allan that its the Phemius (ex-Glenfinlas), as she is almost certainly one of the ex-Glens having a white fo'csle look out mast. Of the four 'Super Glens' only the Phemius and Perseus (ex-Radnorshire) had the single jumbo derrick mounted on the accomodation serving No. 5 Hatch. The Perseus was the only Glen which had a brown painted fo'csle lookout mast probably as she came from the same yard as the four original Blue Funnel 'Super P's'. Therefore by process of elimination she should be the Phemius. The one sure way to tell would be to see clearly the angle of the Stulken derrick, as when the Phemius/Glenfinlas was built at John Browns it was inserted the wrong way round, unlike the other seven of the class.