Above is a London bus blind which apparently can be bought on the net. As for the photos, I tried to post the pictures chronologically, but am not sure I have succeeded! I thought the presence  of a numbers of trees indicated a greater antiquity, and then only one was left.

Below a colourised version:

The last tree grew, grew, until...

...one day it was gone

Here you'll find that the Triangle used to be a meeting place for the suffragettes early in the century!! Here's an extract:

The Recorder
FOR PALMERS GREEN, WINCHMORE HILL AND SOUTHGATE.
JUNE 18th 1914. One Penny 

SUFFRAGETTES MOBBED AT PALMERS GREEN.

"Mrs. Pankhurst's Brother takes Refuge in Magistrate's House.

THERE were lively scenes at Palmers Green Triangle on Saturday night, when a party of local suffragettes was mobbed, and prevented from holding a meeting. Some of the London newspapers gave a rather exaggerated account of the affair, but the experience was a sufficiently unpleasant one for the suffragettes, and, but for the intervention of the police, would probably have been even more exciting. As it was, eggs and flour were thrown, Mr. Goulden, ex-secretary of the Winchmore Hill Ratepayers' Association, and a brother of Mrs. Pankhurst was knocked down, and one lady was roughly handled. Altogether, it was something rather more lively than the scenes to which staid and respectable Palmers Green is accustomed, something of the sort might have been expected, for on the previous Saturday, when the local members of the W.S.P.U. held a meeting the speakers were howled down, their voices being drowned by the singing of popular airs, including "Who killed Cock Robin?" and "God save the King".

Moreover, threats were made that future meetings would be prevented. The interrupters were as good as their word.

When the suffragette party, including Mr. Victor Prout and Mr. Goulden, arrived at the Triangle on Saturday last, they found a hostile reception awaiting them. The lady speaker who was to have conducted the meeting was late in arriving, and while the party were waiting, the crowd, which consisted largely of young men, began booing and indulging in horse play.

Someone bought a copy of a suffragist publication from a lady on the outskirts of the crowd, tore it up and jumped upon it. This caused a disturbance, in the course of which Mr. Goulden's hat was knocked off. Seeing Mr. Goulden bareheaded, the crowd closed upon him with cries of "Mrs. Pankhurst's brother," and in the rush he was knocked down.

Several policemen, both in uniform and in plain clothes, were present, and doubtless seeing that the crowd was bent on mischief, a police sergeant came to Mr. Goulden's rescue, and escorted him in the direction of Fox Lane, followed by a jeering mob."