Thank you both for the replies!
Ideally we wouldn't want to either but the rent was too low to begin with, and with the estate agents sister renting the property we know now why the rent was pitched so low!
We agreed to it without knowing, and whilst they are excellent tenants we do feel compared to other rentals in the area, that it is very low.
its our fault, we know that, but we were time poor and it was all put through in a rush.