Those chimneys are hard to draw. They are not simple rectangles, but a complicated geometric shape, a square put at an angle to another square, difficult to see in the light and shadow.
The crest of the roof is not straight. It goes downwards at quite an alarming angle, as drawn. The windows are not in a straight line with each other, which makes me wonder exactly where the floor is, inside.
I drew this from under the shade of the new building, the “Admiral Ashmore Building”. While I was drawing, the gardeners were making the window boxes, and crushed the geranium leaves. The place smelt of geranium, and earth and water.
I like it that you can see the Barbican towers beyond. I made this observation to a Brother who paused to chat. He told me that these brutalist towers are not popular with certain of the Brothers. They have identified a place in the garden where you can sit, so that the towers are obscured by a tree.
About 2 hours (those chimneys!!), drawn and coloured on location.