Marks & Spencer heir relocates to Monaco after £18M London mansion sale
Jonathan Sieff, a great-great-grandson of Michael Marks, has relocated from the UK to Monaco. The move follows the sale of his London mansion for £18 million last December. Sieff, founder of eco-friendly firm Polymateria, remains linked to high-profile projects and disputes alike.
Sieff’s company, Polymateria, recently supplied biodegradable plastic cups for Taylor Swift’s global tour. The firm specialises in eco-conscious materials, attracting notable attention. Records at Companies House show King Charles holds a 0.25% stake in the business.
The sale of Sieff’s London property and his move to Monaco conclude a chapter in his UK ventures. His company continues to work on sustainable solutions, with high-profile clients and a royal investor. The outcome of his neighbourly dispute was settled, but his business activities persist across borders.
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