There's currently no additional information to be found about Nick Nielsen other than this paragraph from the dust jacket of his first book:
"Nick Nielsen does not live in East London although that is the address he normally gives when cornered. This is his first novel. After an interesting and occasionally successful working life as a semi-professional arm wrestler, he has now settled down to a career at the informal end of the alcohol distillation business. His friends describe him as generously proportioned and possibly fictitious."