Robin Day Polypropylene Swivel Chair (?) / Manufacturer "mp"  

Hello!
Perhaps you can help me identify this plastic swivel chair: I am pretty sure, the design is from Robin Day, but there is no confirming stamp on the bottom side of the chair. (no „hille“ - no „robin day design“)
The only two stamps are the time stamp (´92) and a firm called „mp“. Do you have any information on this manufacturer? As far as I know, Hille was sold in 1983 and so perhaps also some of the production rights. I knew about Habitat, producing Robin Day designs, but never heard of „mp“.
Thanks for any further information.
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