OK, not immediately 087 etc, but just in case anyone missed the announcement of the consultation, it is at
http://www.icstis.org.uk/icstis2002/pdf/ICSTIS_code_condoc250705.pdf
and the closing date is 23 September.
Perhaps two starting points are in pp 16/17 where there appears to be mention of having a pre-connection announcement (free front-end announcement) of call costs and in p22 where surely the connection cost must still be announced.