Chelsea, Knightsbridge and Bond Street offer the best selections. Hatton Garden is an extremely popular area for shops that specialise in jewellery. You will find hundreds of shops next door to each other, the choice is vast. If you have enough money it is worth checking out the shops on Bond Street and around Mayfair. Opening hours are generally 9am to 6pm, Monday to Saturday.
Most stores have winter and summer sales, although the post-Christmas sales are the best.
If you are aiming to hunt for bargains in January start early and prepare to shop till you drop, alongside millions of others. It is possible to send off for a refund at the airport, which usually takes 6 weeks.