	insituform iglsf raises stake in unit insituform group ltd of guernsey channel islands said it has exercised an option to convert a stg loan to affiliate insituform permaline ltd to common shares raising its stake in the unit to pct from pct the remainder is held by permaline s management and an investment group insituform also said james colclough has resigned from its board for health reasons and secretary scott saltpeter has resigned effective june five reuter 
