Each of the group from the Royal Bank of Scotland Mortgage Centre in Greenock will receive a £67,082.50 share of the win in the EuroMillions Mega Friday draw on 30 January.
It took a week for the syndicate to discover they had won, as they normally check the tickets on a Friday.
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Hide AdSyndicate leader Margaret Kane, 46, said: “Every Friday I take our tickets to the shop and get the assistant to check them on the machine.”
Some of the group now plan to use their winnings to help with a deposit on their first homes.