British firm Mathmos, the inventors of the lava lamp, are celebrating their 50th birthday this September.

As part of a season of commemorative activities, visit the shop in the Royal Festival Hall to see the world's largest lava lamp and find out about the history of the lamp.

You can also shop from the Heritage collection, inspired by vintage colours, in celebration of Mathmos' long history.

Part of London Design Festival at Southbank Centre.

Southbank Centre Shop, Royal Festival Hall
12 noon - 8pm daily