As well as catering, the five-year deal will see the company offer sales and marketing support for the venue, helping to boost daytime use.
Vicky O’Hare, managing director at Party Ingredients, said the venue offers "discreet, flexible rooms" for entertaining with "exceptional" outside space.
A launch reception will be held at the end of the month to celebrate the venue deal and introduce the venue to City companies and clientele.
Party Ingredients also holds catering contracts at Apothecaries’ Halls in the City and Ravens’ Ait in Surbiton.
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