Hi folks, can somebody help?

I search for dates of commission of British World War One naval whalers and
trawlers:

Z Whaler type (Zedwhale [ex Meg, ex Z.1], Balena [ex Z.2], Beluga [ex Z.3],
Bowhead [ex Z.4], Blackwhale [ex Z.5], Bullwhale [ex Z.6], Cachalot [ex
Z.7], Cowwhale [ex Z.8], Humpback [ex Z.9], Rorqual [ex Z.10], Rightwhale
[ex Z.11], Icewhale [ex Z.12], Finwhale [ex Z.13], Pilotwhale [ex Z.14],
Articwhale [ex Z.15]) British patrol craft, built 1915/16 somewhen, dates of
commission?

Mersey type Admirality trawler: WWI, 1x12pdr, dates of commission?

Castle type Admirality trawler: 1x12pdr, WWI, dates of commission?

Admirality Drifters: wooden 91 launched 1918-20, 100 Canadian built
CD.1-CD.100; 123 steel launched 1917-20; 48 cancelled; dates of commission?

Thank you very much in advance!!

--
Friedrich
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