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Thanks rsvp & zacs master, it's good to hear from fellow Border Collie owners/lovers, yes I agree it's all in the head he has many phobias, hosepipe though has never been squirted with water vac/lawn mower/grass strimmer, my hubby takes the dogs out lunchtime on his own for their 2nd walk and I hoover then, we have tried everything to get him used to it all to no avail, he has strangely got used to when the army are about if they are firing but if they start shouting which they invariably do he is a quivering wreck, I've heard though that this breed has particularly sensitive hearing, that would explain it.
I will certainly try the harness tomorrow and yes we have another door to the living room so will open that.....fingers crossed, will let you know what happens.
Thanks for all the help and support to everyone.