There are only two British armies in France, both contain three front line infrantry corps. I Army has two cavalry corps in reserve whilst II Army fields a reserve of a single infantry corps. The independent TA garrison of Calais has two full strength corps with a third understrength corps attached. British GHQ contains a single infantry corps whilst another regular infantry corps is present at Calais but moving to Dunkirk.
The differences between the types of troops can be seen here, for the most part the British armies are composed of either active service troops (purple flag) or veteran troops (yellow). The BEF cavalry reserve also contains an elite corps (Orange). The Calais force is made of mobilised troops. These are inexperienced in battle and lack the full time training of the main army. They also lack the combat abilities of the full time infantry corps. The third corps is understrength currently, a side effect of Britain relying on a volunteer army is that there are less recruits to refill understrength units until conscription is enacted.
II Army is moving for an attack on Douai, the rest of the British army is holding position. Until conscription is enforced it's important to keep British casualties down in order to maintain as many corps at full strength as possible.
The Royal Navy is at sea still, the recent arrival of the modern battleship HMS Queen Elizabeth is a boost to the home fleet. Several ships or squadrons are damaged and the RN will soon have to head back to Scapa Flow in order to repair, so far the RN have managed to maintain control of the seas and kept the German High Seas fleet bottled up at home.
British Economy
The British economy is also running at a loss, although it's probably better able to absorb this than the French economy. The British economy is building more units than the French but is running at a smaller loss. Currently building are:
4 Infantry Corps. One infantry corps is due to arrive in the summer and will form the core of III Army, two more will arrive in Nov-Dec turn and are assigned to III and IV Army. The HQs for III and IV army are under construction (free!) and will arrive in the summer. The final infantry corps will arrive in May 1915.
II Army's artillery is under construction and should arrive in June, other support forces under construction are two heavy tank corps due to arrive late in 1915.
Two fighter squadrons are under construction and will arrive in May and June 1916.
The Royal Navy has several ships under construction, two destroyer flotillas will arrive in August to combat the u-boat menace. HMS Barham (Queen Elizabeth BB) will arrive in Nov-Dec 1915 and will go to join her sister ship in the Home Fleet.
British production is allowing a flow of 9 MUN each turn to the British stockpiles.
