Build A Timber Slat Fence Where To Get Wood, Timber And Other Things To Build A Shed For An Allotment?

Where to get wood, timber and other things to build a shed for an allotment? - build a timber slat fence

It took only a field but not paid or so, where can I get wood, timber and other bits to build a shed. Where can I find gardening bits and bobs, they maintain. I do not spend much money for him, even better if I could get free. Or is there a place in the vicinity of Lincoln, United Kingdom, where I can get a dump of the bits?