Photographer, fell-walker, engineer, author, ergonomist, bellringer and more ...
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Contacting me: john (at) jaharrison (dot) me (dot) uk Replace (at) with an @ sign and (dot) with a full stop. Copyright: All material on this website is my © copyright, unless stated otherwise. You may reuse material for non-commercial purposes, but please contact me before doing so.
" All models are wrong, but some are useful. (George E P Box) "
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