Does anyone know of any respite services for a vented 13 year old with complex needs?

Hi @mickeyp -welcome to the community, & thank you for joining. I've had a look online, & come up with a couple of links. The first includes a link to a Carers Hub, which might be a good place to learn about a suitable place for respite provision. Please see:

Some general info: https://www.nhs.uk/conditions/social-care-and-support-guide/support-and-benefits-for-carers/carer-breaks-and-respite-care/

Hope some of this may help.