The only thing I can find with a clear enough view is this shot of Royal Oak from 1935+ showing new bulge and what looks like a pair of paravanes below the bridge. Note the twin 4".
![[ img ]](https://www.dropbox.com/s/6ul4neufpbhfgli/Rclass.jpg?dl=1)
Photo from Siegfried Breyer p54
I have been trying to fix a date to the photo: the following is from Wiki'
The ship received a final refit between 1934 and 1936,when her deck armour was increased to 5 inches (12.7 cm) over the magazines and to 3.5 inches (8.9 cm) over the engine rooms. In addition to a general modernisation of the ship's systems, her anti-aircraft defences were strengthened by replacing the single mounts of the AA guns with twin mounts for the QF 4-inch Mark XVI gun and adding a pair of octuple mounts for two-pounder Mk VIII "pom-pom" guns to sponsons abreast the funnel.[14] Two positions for "pom-pom" anti-aircraft directors were added on new platforms abreast and below the fire-control director in the spotting top. A HACS Mk III director replaced the Mk I in the spotting top and another replaced the torpedo director aft. A pair of quadruple mounts for Vickers .50 machine guns were added abreast the conning tower. The mainmast was reconstructed as a tripod to support the weight of a radio-direction finding office and a second High-Angle Control Station.[17] The forward pair of submerged torpedo tubes were removed and four experimental 21-inch torpedo tubes were added above water forward of 'A' turret