Marmite Re-Homing Vans Spotted Across London

We've been seeing these four wheelers around town today. What are Marmite up to...?
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We've been seeing these four wheelers around town today. What are Marmite up to...?

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These vans have been spotted around London today, appearing to be a part of a 'Marmite Rehoming Unit'.

Anybody else spotted them? And any ideas what that could mean? We're stumped.

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