June online retail sales surged to their highest point in two years driven by fashion, which soared 29% over the month.

Online retail sales soared 20% year-on-year and showed the sharpest growth since June 2011, according to the IMRG Capgemini e-Retail Sales Index.

Against May, June e-commerce sales jumped 2.4%, which is the first time the index has recorded a rise between May and June in five years.

M-commerce sales rocketed 136% against last year and also rose 8% on the previous month.

IMRG said the June sales jump led to online outperforming in the first half . Online revenue increased 16% over the six months, ahead of the 12% forecast at the beginning of the year.

IMRG chief information officer Tina Spooner: “The solid growth last month was driven by a strong performance in clothing, perhaps as a result of heavy discounting, however the UK online retail market has performed remarkably consistently throughout 2013 so far, which may signify an overall improvement in consumer confidence that will be welcome news for many.”