A giant 50ft rubber duck is being prepared for a sail down the River Thames to celebrate the launch of a Facebook FUNdation, a bursary granting funds and rewards for daft ideas to encourage the British to have more fun.
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The money will help pay for mental health and counselling services, regeneration in the west London neighbourhood and a new community space.
The small device was hidden in a grate in the ceiling in the only customer toilet at a Starbucks coffee shop.
The jewellery, worth an estimated £60,000, was being stored in a bank safety deposit box for safekeeping.