My second, Conceptual Maths, was published at the end of December 2022 in the UK.
The book is available to order in the UK from Amazon: https://www.amazon.co.uk/gp/product/1785835998/ref=dbs_a_def_rwt_bibl_vppi_i1
Or in the USA: https://www.amazon.com/gp/product/1785835998/ref=dbs_a_def_rwt_bibl_vppi_i1
Or from the Crown House website: https://www.crownhouse.co.uk/conceptual-maths