Mary
The airship in the first photo looks to be a Submarine Scout P airship. Six of these were built between January and June 1917; one was wrecked in March 1917, two were lost at sea in November and December 1917 and the three survivors were decommissioned in September 1919.
The airship in the second photo is a Submarine Scout Zero airship (as confirmed by the SSZ portion of the serial number). If the number is 6, then the airship was delivered in July 1917 and survived the war, being declared unserviceable in October 1919.
There's a stack of information at The Airship Heritage Trust website
http://www.aht.ndirect.co.uk/airships/ss/index.html
Graeme