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just to let you all know that when i returned to the box a little while ago, the bird was standing upright, looking really perky and cheeped at me! i have taken it outside now and climbed the world's most wobbly brick wall, edged along it one handed two gardens down and had a big fight with the mass of ivy and weeds on top of a shed where i think it came from.
got really wet, covered in insects, fence bits and ivy reaching through and it hopped into the dense bit of growth cheeping like a lunatic. i feel a bit better putting him in there as i don't think the cats locally can stray into the middle of it and i am keeping my two little buggers inside for the rest of the day to give the little thing a fighting chance.
thanks for all your advice and although i feel really sorry for the little thing as it is defenceless, he/she is in the right place and it's parents may well find it if it keeps up the racket it's making! thanks again x