Just to clarify, it is current year 8's that should apply?
DS at an indie, which we love, but we are struggling financially. Wilson's feels like it would be able to offer him a similar environment/opportunities.
I downloaded the form from the Sutton website. Slightly concerned that part of it has to be handed in to the current school Headmaster to complete. Do you think this could have an ill effect in the school's perception of DS?
If your financial struggle turns into an actual inability to pay the fees, the school may offer you assistance - or it may just regret the fact that your DS will be leaving at the end of term. Have you mentioned that you are finding the fees a bit of a struggle?
If a bursary might be forthcoming, then being asked to complete a form might prompt the school to mention this; if they are not in a position to offer help, then it is not in the school's interest to hinder your attempt to find a suitable alternative for your DS.
I would add, that the system here when the school for which you are making an in-year application is selective and your child's transfer is dependent on a future test result, the 'part 2' form isn't required until it is known that you have a place (and in practice, not usually asked for), so you don't have to tell the current school unless your DC is successful. I don't know how it goes in your area.I though.