Can the national trust only afford to pay a small proportion of what you need to carry out the work?
It's estimated that to run the project for a 10 year period it would cost in the region of £5.3m, more details here... Fix the Fells This is a big chunk of money for any charity to find. Working in partnership means not only are the costs spread, but the skills of individuals from the various partner organisations can be used to their best effect. :)