entrance to the lady garden, Tyntesfield, Wraxall, Somerset, UK

Tenax Propositi means 'Firm of Purpose' or maybe ‘in guano we trust'

for more about Tyntesfield (now owned by the national trust) http://en.wikipedia.org/wiki/Tyntesfield

this magnificent piece of rust has now been ‘restored’ by the national trust in the typical dim-witted heritage-industry way that it is ‘restoring’ Tyntesfield