The group saw its underwriting profit fall 23% to £171mln, while net written premiums down by 5% to £3.2bn on a constant currency basis, and its combined ratio weakened to 94.7%, down from 93.2% in 2017. First - half profits at RSA Insurance fell by 15 % to £ 304 m ( $ 390 m ) from £ 360 m the year before . RSA blamed the fall on a drop in net written premiums alongside additional costs deriving from adverse weather in the UK and Canada , with the latter pushing up costs to £ 53 m above the five - year target . Underwriting profit fell 23 % to £ 210 m over the period with group weather costs amounting to £ 155 m , with bad weather in the UK , including the Beast from the East , costing the company £ 47 m in pre - tax profits .
First - half profits at RSA Insurance fell by 15 % to £ 304 m ( $ 390 m ) from £ 360 m the year before . RSA blamed the fall on a drop in net written premiums alongside additional costs deriving from adverse weather in the UK and Canada , with the latter pushing up costs to £ 53 m above the five - year target . Underwriting profit fell 23 % to £ 210 m over the period with group weather costs amounting to £ 155 m , with bad weather in the UK , including the Beast from the East , costing the company £ 47 m in pre - tax profits .