[Exim] transport - pipe problem, not passing ARGV's

I have the following transport
program:
driver = pipe
user = admin
group = users
command = /home/admin/t ${lookup mysql {MYSQL_SPOOL}{$value}}
ignore_status
delivery_date_add
envelope_to_add
return_path_add

It works fine in that it pipes the data as the user as it should but its not
passing the variable at the end as an argument

I know we can access the ENV from inside the script but this is NOT an
option with this

I have looked and look but to no avail, any help?

Darren