Blood lead levels were determined for 579 eleven year old children. The range of blood lead levels was from 0.19 to 2.41 mumol/l with a geometric mean of 0.49 mumol/l (geometric SD 0.07) and an arithmetic mean of 0.54 mumol/l (arithmetic SD 0.24). Two children had levels above 1.45 mumol/l. There was no significant correlation between blood lead levels and socio-economic status. Ten children with elevated blood lead levels (greater than 1.11 mumol/l) were reassessed and the results from all but one child had returned to a lower level. In nine out of ten of these cases recent inside paint stripping activities had been carried out in the child's home.