Government Code & Cypher School (and a hidden message)

During World War I the British Army and Royal Navy both had separate intelligence agencies. Military Intelligence 1b, MI1(b) and Naval Intelligence Department 25, NID25, respectively. NID25 was initially known as Room 40, or 40 O.B., with O.B. referring to 'old building'. 

Following the conclusion of World War I the Cabinet's Secret Service Committee recommended that a peacetime codebreaking agency should be created. Lord Curzon, chairman of the Cabinet's Secret Service Committee, tasked Hugh Sinclair, Director of Naval Intelligence, with creating the new department.

Hugh Sinclair merged staff from NID25 with MI1(b), with the new agency consisting of between 25-30 officers, with roughly the same amount of clerical staff. Victor Forbes, of the Foreign Office, chose the cover-name 'Government Code & Cypher School (GC&CS).

The Government Code & Cypher School moved into Watergate House, Adelphi, with the Admiralty's Alastair Denniston, previously an NID25 officer, as its operational head. 

Its public directive was "to advise as to the security of codes and cyphers used by all Government departments and to assist in their provision". However, it also had a secret directive: "study the methods of cypher communications used by foreign powers".

Although officially formed on November 1, 1919, the Government Code & Cypher School produced its first decryption on October 19, 1919.

In 1921 the offices moved to the Broadway Buildings, opposite St James's Park, in the same building as the SIS, and came under the supervision of Hugh Sinclair. At the time Hugh Sinclair was Chief of SIS and Director of GC&CS.

On February 14, 2019, HM Queen Elizabeth II unveiled a City of Westminster plaque to mark the centenary of GCHQ.

However, keeping with the codebreaking, communications and cypher work of GCHQ, the plaque contains a hidden message, which most people don't even realise. 

Can you uncover the hidden message?

If you can't figure it out, there is a clue below. 

Various characters, on the plaque, have a dot or dash beneath them. 

If you find them all it reveals the message... 

Highlight the space between the quotation marks, below, to uncover the answer.

"1 HUNDRED YEARS"

So, did you work it out, or did you cheat?

Walking with Keilyn: Victory in Europe 80 Celebrations (VE-Day 80)

Monday May 5, 2025.

With the Victory in Europe 80th Celebrations getting  underway, today, Keilyn and I set off to enjoy the festivities. A taxi took us to Watford Underground station, where we boarded a Baker Street-bound train. My mum and uncle Martin had left earlier in the morning, heading for The Mall and St James's Park, in order to see the procession and catch the flypast from there. We changed at Finchley Road and caught a Jubilee line train, to Green Park, as Keilyn thought it would nice to catch up to mum and Martin. 

On exiting Green Park station we were herded, like cattle, down the east path towards The Mall. Vendors were selling Union flags and other merchandise, as the crowds flowed in both directions. On reaching The Mall we were given VE Day flags and then realised that there was no way we would see anything and, with my mum and Martin on the other side of the road, we retraced our steps, heading for Piccadilly.

Photo © Keilyn J A Morrissey.

Heading east, along Piccadilly, we made our way against the throng of people still heading to Green Park, before we reached Piccadilly Circus. To our surprise Piccadilly Circus was deserted of people, so we headed towards Leicester Square, stopping at Greggs to pick some nourishment, which we ate in an almost deserted Leicester Square. 

Once we had eaten we had our photos taken with Mr Bean and Paddington Bear, before heading along Irving Street and, after crossing Charing Cross Road, followed William IV Street to Strand. Again the roads were fairly clear, so we headed down Adam Street, where Keilyn had her photo taken outside the door of Number 10, before we turned down John Adam Street, heading for York Buildings.

At the end of York Buildings, on the left-hand side, is a lovely building which was the first home of GCHQ (Government Communications Headquarters). A green plaque, affixed to the wall, tells us this. However, if you look at the plaque closely, it contains a hidden message, that many people miss. Can you work it out?

We then entered Victoria Embankment Gardens, beside the York Watergate, and headed for Kippo's Coffee & Gelato, as I was in need of a coffee, while Keilyn was aching for a hot chocolate. With drinks in hand we walked along Victoria Embankment, before climbing the steps to Waterloo Bridge. Our vantage point from where we would watch the flypast.

As we still had time, we crossed the bridge and visited the National Theatre, checking out the view from its terraces and using the facilities. We then headed back up onto Waterloo Bridge, which was starting to fill up with people eager to see the flypast. We found a spot, almost in the centre of the bridge, and waited. I was glad that we had dressed for the weather, as the wind began to pick up and, off beyond Canary Wharf, we could see rain falling from the clouds. We all hoped that it would pass around us, which it did, fortunately. While we waited we took pleasure in waving at the tourists on the boats, passing below us, cheering when they waved back.

I had written a list of the order of the aeroplanes taking part in the flypast, which Keilyn read from as the BBMF Lancaster came into view. Then followed a Voyager and an A400m Atlas, a C-17 Globemaster III, a P-8 Poseidon with Two Typhoons, an RC-135 Rivet Joint with 2 F-35B Lightnings, the Red Arrows brought up the rear with 4 Typhoons.

The flypast took just over 5 minutes, but was really impressive to watch... and hear.