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In our photo the right-hand side of the 1905 plaque is just visible poking out from behind the bow window at the left. The 1884 plaque is the next one along.

The plaques are foundation stones so the dates specify when construction was begun. This suggests that the 1905 stone is for the 1907 extension which tallies with the structure on site (with the single bay window on the ground floor and two windows above, a well-integrated extension).

If the 1884 plaque is a foundation stone then it could be for the 1887 John Morley Wing, but that seems odd since the stone is on what doesn't look like an added wing, but the main building to which extensions have been added, so we'd expect it to have a foundation stone dated shortly before 1881.