Looking through a book of policeman's memoirs from a British "Special Branch" officer named Edwin Woodhall I came across this brief storey of an attempt to abduct Alexi during an unspecified visit to Britain and how Branch officers foiled it, which I though might be of interest:
"A letter was received at the Yard requesting the police to reinforce their watch on the Czarevitch, as an attempt would be made either to abduct him or to do something worse.
That same afternoon Sweeny was put on the alert from headquarters by telegraph. While he was in the main street of Southsea, walking behind the Czarevitch and his tutor, he noticed two men following them. To make sure that his suspicions were correct he whispered to the tutor to go into a shop. This was done, and Sweeny planted himself outside and appeared to be looking into the window. In the reflection in the plate glass he could see the two in urgent debate at the far corner of the street. He decided to act.
He slid unobtrusively into the shop as two women came and looked in the window, and warned the tutor to take his Royal charge home at once by cab, as he had seen something which aroused his suspicions. The tutor, a Swiss who spoke fluent English, did not want more than one telling....with a promptness that did him credit he removed the Prince out of harms way.
When Sweeny came out of the shop he took the bull by the horns and went straight over to the Nihilists and point blank asked them what business they had in the man accompanying the boy in the sailor suit. He was of course, playing for time.....His object must have occurred to the Russians, for, without a seconds hesitation, one of them moved off quickly to where Sweeny could see the tutor and Czarevitch waiting for the cab they had just signalled. He had reckoned, however, without Sweeny for as he strode off two men unobtrusively pulled him into a side street. They were two extra officers whose job it was to shadow Sweeny, and to act, if they saw him take a white silk handkerchief from his pocket!"
The two men turned out to b Russians armed with knives and they were taken to London under escort where investigations showed a connection to "The Russian Nihilist Movement" and as one was wanted for bankruptcy offences and the other for fraud and arson they were deported back to Russia.
Phil Tomaselli