funny you talking about the explosive qualitys of swan vesta matches Izzy, during the bad winter of 62/3 I was down in Tidworth Garrison, in some old nissen huts, the type with 2, of those old pot belly stoves with the pipe chimmneys for heating, anyway a lad called Larry Brown from Devon, not the brightest of chaps had a cocoa tin full to the brim with swan vesta heads??, decided for reasons best known to himself to drop it into the fire of one of these stoves. Well the resulting explosion was heard the far side of the camp and roused the guard and piquetmen, (I heard later that they thought it an IRA attack) it blew the stove pipe 40 meters and blew out three windows set fire to some beds and put him and another bloke in sick bay for a month with quite bad burns, I never saw either of them again so summised they got slung out.
paul