Supreme Court, Parliament Square SW1

The window keystones on the right of the main facade of the old Middlesex Guildhall show Agriculture. Up to Victorian times, Middlesex was covered with small farms and market gardens supplying the city with produce. Cobbett hated it. In Rural Rides he fulminates: "All Middlesex is ugly, notwithstanding the millions upon millions which it is continually sucking up from the rest of the kingdom....the soil is gravel at bottom with a black loam at top near the Thames; further back it is a sort of spewy gravel; and the buildings consist generally of tax-eaters' showy, tea-garden-like boxes and of shabby dwellings of labouring people...dirty, and have every appearance of drinking gin."
From left to right, the first four figures are growers of wheat, hops, fruit and grapes. Then there is a bloke holding an animal that I'm not confident in identifying. It seems to have either trotters or hooves, so it could be a piglet or a lamb. The next figure along, however, is clearly a shepherd with his crook, so I am going with piglet until presented with evidence to the contrary.

Supreme Court, Parliament Square SW1

The mouldings over the ground floor windows on the left hand side of the main facade of the old Middlesex Guildhall are decorated with figures connected with the River Thames. The old geezer with the trident must be fishing for eels, as then he would fit in with the rest of the trades, but Fehr has clearly taken the opportunity to make him do double duty as Old Father Thames.
From left to right:

Fishing with nets for salmon and trout

Kelping

Spearfishing for porpoise, seal and sturgeon

Woman with her hand on the bow of a boat

Fishing for eels (the trident is dug into the mud and the eels are trapped between the tines)

A fishwife takes fish to market.
As ever, let me know if you think I have got any of these stupidly wrong.

Supreme Court, Parliament Square SW1

The main entrance of the old Middlesex Guildhall is marked by three friezes by Henry Fehr. Over the arch is Henry III granting a charter to Westminster Abbey - the king stands at the left next to the Abbot, who I like to think is Philip de Lewisham (Abott in 1258) purely because his name is so unlikely. A Benedictine monk (Westminster was a Benedictine house), a cardinal and the Archbishop of Canterbury also appear.
On the left, the scene is the signing of Magna Carta by King John. He is backed by a couple of bishops (no fewer than eight bishops were there, including the Archbishop of Canterbury, Stephen Langton), a couple of monks and assorted Barons. Curiously, neither of the blazons on the shields correspond to those of any of the twenty-five barons at the event - perhaps they are members of the royal household.
The frieze on the right shows Lady Jane Grey accepting the crown of England on the death of her cousin, Edward VI in 1553. Her husband, Lord Guilford Dudley, stands behind her, and I think that must be her horrible mother, Lady Frances Brandon, behind the crown. The crowd of men presumably represent the Protestant nobility who pushed her onto the throne, including John Dudley, Duke of Northumberland, Guilford's dad.
Unfortunately, the conspiritors underestimated the power of Edward's elder sister Mary, who mounted a counter-coup. By the end of the year all had been executed. Lady Jane was still in her teens.
I find it difficult to understand why these two last events were chosen for a building designed to celebrate Middlesex. Runnymede is in Surrey, and Lady Jane Grey had no links with the county at all. It seems to be simply Edwardian romanticisation of the past.
Right in the middle is a small panel depicting the Great Hall at Hampton Court, for some reason, with a tiny figure of Law on each side. To left and right of the central frieze are statues of Prudence and Justice, under ornate canopies.

Supreme Court, Parliament Square SW1

The main tower of the Supreme Court (formerly Middlesex Guildhall) has an arch of figures by Henry Fehr with Britannia (unusually with a sword rather than a trident) flanked by (from left) Architecture, Literature, Government, Music, Truth, Law and Shipping, a heterogeneous but virtuous group. Above them stands St George.