Argos hailed a key ­milestone in its 40-year history as it threw open the doors to a trial store where tablet computers will replace the retailer's trademark laminated catalogues.

Customers will be able to browse, check product reviews and order via in-store iPads at six "digital concept" shops, with a 60-second fast-track ­collection service for those pre-ordering online or on mobile devices.

Tables of tablet computers will take the place of its traditional catalogues, pencils and paper slips across the trial outlets, although Argos assured customers it would not axe its catalogues altogether, and would still make them available on customer service desks for those "more comfortable using them for shopping".

The first of the concept stores opened at Old Street in London, with three further sites planned in Marble Arch, Old Kent Road and Chancery Lane, as well as stores in Colchester and Dunfermline.

It comes as the Home Retail Group-owned chain plans to transform itself into a digital-led retailer.

The firm said it already makes more than 40% of sales online, while revenues from smartphone and tablet orders are also increasing at a rapid pace and now account for 16% of total sales.

It recently posted a more than doubling in operating profits to £7.7million in the six months to August 31, up from £3.3m a year earlier, thanks in part to early progress on its overhaul.

Argos insisted its store estate will remain at the heart of its business, with around 90% of all sales still involving a shop.