The British naval forces in the Baltic according to the Secret Admiralty Weekly Intelligence Summary No. 2 dated 17 July 1920

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An item reported that in the week ending 17 July in the Baltic were stationed the British light cruisers HMS Caledon (S.N.O.) and Castor, destroyers Shakespeare, Valhalla, Vimiera, Vanquisher and Wessex, depot ship Greenwich and the trawler Frederick Bush. On 27 July was at Reval [Tallinn, Estonia] 1 destroyer, at Riga [Lithuania] 1 destroyer, at Libau [Liepaja, Latvia] the S.N.O. with the cruisers HMS Caledon and Castor and 2 destroyers, at Danzig,Poland 1 destroyer and at Copenhagen, Denmark the Greenwich.

Source

The National Archives CAB-24-109-68. Secret Admiralty Weekly Intelligence Summary No. 2 dated 17 July 1920