Alice has received an accelerated [section 21](https://www.gov.uk/evicting-tenants/accelerated-possession-orders) claim from the court on form N5B, which legally is invalid. There exists a long and quite involved form intended for use in answering N5B accelerated claims, namely form N11B. 

Alice instead submits her defence to the claim on a simple handwritten and signed letter indicating her case number, and stating the reason why the claim is properly invalid and her desire to plead this in a hearing. 

What happens with this letter when it is received by the court, as it is not on the intended form, and what happens with the case more generally? Does it get listed for a hearing? Do the contents of her letter reach or get considered by the judge?