Terms and agreements
Many dioceses require a 'working agreement' between a parish and an MSE/WP. In many ways this is good, and is likely to help avoid any misunderstanding about roles and relationships, duties and expectations - provided it is an expression of fundamental good will and mutual care.
Some model agreements can be found via the links below. Do you have comments or know of other examples? Please let me know.
Chelmsford Diocese model
Chester Diocese model