I am sure ex-KGB ex-GRU, maybe even current intell agent.
More likely it’s Muslims In Pajamas, working out of their mom’s basement, using the internet.
There are so many Somalis in London, and shipping schedules are so openly available, and calling internationally to Somalia (they even have country specific scratch cards to Somalia) so easy, that thinking it has to be ex-KGB/GRU (or, to stretch things further, 'current intel') is tantamount to Pakistanis claiming the Israeli Mossad had something to do with the deflated tire of the Islamabad cricket league's bus. Possible, yes. But so highly improbable as to be nigh ludicrous, particularly since such intelligence services have far better things to do, and also because there is a far more likely explanation.
In this case, a city with one of the highest immigrant Somali populations outside Minneapolis.
That makes more sense than salty-dog Ruskie James Bond wannabes channeling information to Somalis in the Horn of Africa, when Mohammed's cousin living in London could pick up a paper, get a scratch card, and tell Mo to be on the look-out for a Maersk ship heading to Zanzibar a week from now.
Perhaps some community organizer somewhere?