As has been noted, W.E. Patt. '25 was designated as Web Equipment, Pattern 1919 in Canada. To distinguish it from the OTHER Patt. '19, I've tried to consistently refer to it as Pattern 1925. However, the title and text of Canadian Militia Order 500 are quoted as written, so you may well find both designations in the same paragraph.
Carriers, cartridge

The Pattern 1925 Cartridge carriers were introduced into Canada with the Web Equipment, Pattern 1919, under Militia Order 500, dated 28th September 1928. The carriers are mirror images of each other, and connect to the Strap, back adjustment. Each Carrier has four pockets, and each pocket holds 15 rounds of .303-inch ammunition in three 5 round chargers. This provides a total ammunition load of 120 rounds. This pair of Cartridge carriers is maker marked "M.E. Co." and dated 1927. The cartridge pockets integrally woven, rather than sewn like the Canadian ones. If you compare these Carriers with the Canadian made examples in the Patt. '25 Blue-Grey Equipment Carrier Section, the differences can be easily seen. The right-hand Carrier has the spigot half of a press fastener, which mates with the crown fastener on the Frog.
The rear side of the same pair of Carriers.
The picture at left shows the retaining strap sewn in under the cartridge pocket flap. This was to prevent the chargers from falling out if the flap came unsnapped. The strap is "pinched" by stitching, at the fold. It differs from the similar detail on the real, as opposed to the mis-named Canadian, Patt. '19 Cartridge carriers. In that design, the strap was of the "slider strap" principle, first used on the left-hand Mark II Cartridge Carriers of Patt. '08 W.E.
Frog, bayonet

The Pattern 1925 Bayonet frog was introduced into Canada with the Web Equipment, Pattern 1919, under Militia Order 500, dated 28th September 1928. It is identical to the W.E. Patt. '19 Infantry Equipment Bayonet Frog and has the crown half of the fastener to attach it to either the left cartridge carrier or the back adjustment strap. It is designed to carry the Pattern 1907 bayonet in scabbard. An almost identical Frog, in khaki and without the fastener, was used as the first variant of Frog issued with W.E. Patt. '37. This example is maker marked "M.E. Co." and dated 1927.
Carrier, water bottle
The Pattern 1925 Water bottle carrier was introduced into Canada with the Web Equipment, Pattern 1919, under Militia Order 500, dated 28th September 1928. It is an envelope type Carrier for the Mk. VI water bottle. It does not have a retaining strap, relying on a tight fit to keep the bottle in place. This same type of carrier was re-used, in khaki, as a late issue variant of the Patt. '37 Water bottle carrier. I do not have an example of this type of carrier.