Hi all! I've really quick question.. I need to put up a metal pole in the garden for my extendable washing line. I'm a bit short on pennys at the minute so ideally I'd like to use materials I already have... rather than forking out for concrete, postcrete or a bag of cement and aggregate, can I make a suitable concrete for this purpose using my bag of ready mix mortar from B&Q and the bag of 20mm gravel that I've got in my shed? Any suggestions for ratios? Sorry if this is a daft question! Would appreciate any help. Thanks in advance, Rich.