Bluewater
Lakeside
Westfield
Stratford
Canary Wharf
Whit gift centre in Croydon
Intu centre in Watford
Brighton Marina Village an hour south on the train.
Bluewater
The Westfield shopping centres
They are mostly very much the same. However, if you are prepared to travel a bit further (1hr 37 min), you can reach Gunwharf Quays in Portsmouth (Right next to Portsmouth Harbour Station). it's a very nice retailvillage with waterfront cafes and the Spinnaker Tower
No point going outside London when you have Westerfield at Stratford
Saint Albans or Luton maybe a good place to try, less than 1 hour by train
Bluewater
Want something outside london
The Westfield shopping centres
Westfield!