Living Room 2HomeKitchen
Several oil paintings and photos of men in British uniforms can be seen in the living room of Steed's third flat.

Landscape oil painting from an unknown artist next to the entrance door, above the brolly stand.
The painting shows grass hills with a small stream and a single tree at the right of the stream.
Oil Painting of an unknown artist on the left to the stairs which are leading to Steed's living room, showing possibly the 2nd Royal North British Dragoons (Scots Greys) at Waterloo riding in the line, maybe a it's scene from the battle. The horse seems to be a chestnut at first glance, but the colour photograph from the flat shows a dark grey.
Oil Painting of an unknown artist, showing a foot soldier; could be a foot soldier of a Highland regiment in the mid 18ths century.
You can't see the face of the soldier on the painting above his mantelpiece in the third flat, but it could be an officer’s uniform of the 24th foot (infantry) regiment around 1830 (Crimean War), the red coat and shako (helmet) fit. The French drummer (1804) porcelain is a Capodimonte (?) figurine, it reappears in the series 5/6 flat, the right one is a French  Cuirassier Officer around 1812. It could be a Frankenthal Wessel Porcelain Napoleonic Military Figure.
Source
Besides the oil paintings, there are three photographies of men in British uniforms (World War 1 ?) in his flat. The left photograph of the elder officer has its place on Steed's mantlepiece, the other two stand on top of his secretary desk to the left and the right of his vase clock. It's unknown who these men are, maybe they were relatives of Steed.
There's a fifth oil painting opposite to the entrance door, but it can be seen only once (partially) behind Steed's back in episode Too Many Christmas Trees when he opens the door for Mrs Peel.
below - photo of a polo match Photos of polo matches Polo or horse racing trophies
On the wall hang five photographies from polo matches. Steed owned polo ponies and plays polo (The Medicine Men; Death of a Batman). On the small cabinet below one can see his polo or racing horse trophies, there also stands a small model of a coach which Steed uses as a letter holder (Honey for the Prince).
Vase clock on his desk.
One can't see ceiling lamps in 4 Queen Anne's court, but there are several  lights or lamps in his flat.
Besides his collection of guns, rifles, daggers, sabers and halberds, Steed is also collecting models of cannons and porcelain figures of soldiers, the the two figures on his mantlepiece are a drummer and a cuirassier from the Napoleonic Wars. Both figures reappear in his 4ths flat.
Cannons can also be seen in his second flat (near the windows and on the bottom before the mantlepiece) and in his fourth flat on the mantlepiece, porcelain figures stand in his fourth flat on the chest of drawers next to the entrance door.
A small Lord Nelson statue stands on his deks in flat 3.
Mrs Peel used Steed's tape recorder in Honey for the Prince to leave him a message. It's a Phillips four-track Tape Recorder EL 3541.
In Steed's second flat were many paintings or drawings of ships, several nautical instruments and other objects conneted to seafaring. At 4, Queen Anne's Court Steed owns two model ships. The larger three master stands on a table next to the windows. He's reparing the ship with his colleague in Two's a Crowd. A smaller ship can be seen on the table right to the mantlepiece.
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John Steed's Flats - No.3
4, Queen Anne's Court - Photos, Paintings, Objects
Next to the entrance area is a single sconce, a 19ths century wall mounted torchiere (or a large coach latern), maybe made of brass or gilt-bronze.
The small carriage, that Mrs Peel used as a letter holder in Honey for the Prince, could be a 19ths century smokers compendium in form of a coach.