Wanted: Old Tank For A Sump (Wirral/merseyside/cheshire)

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Hi,
 
Does anybody have an old tank laying about unused, that I could buy for use as a sump?
 
Ideally, I'm looking for a 60" x 18" x 18". But can go up to 8ft in length. The longer the better to be honest.
 
Let me know if you have anything!
 
Thanks.