Toilet humour

I had an interesting letter arrive in my work in tray recently.  It had me in stitches for at least 10 minutes.  There was a note and leaflet.  The note advised me I might be interested in the products advertised on the leaflet because of all the work I do with woodland communities and people in remote wooded areas ....   http://www.natsol.co.uk/   .......

I didn't laugh at this one, my favourite (and cheaper model) visited this year.  This was constructed by/with/for volunteers.