At Ashgate we use Sign supported English which borrows signs from British sign language and follows English grammatical structure. Sign supported English is used to support spoken English.
We use materials and resources from the ‘Let’s Sign’ series by Cath Smith. https://letssign.co.uk/about/
It is not necessary to buy this book, however, if you'd like a copy for home use here is the Amazon link (there are other stockists).