Midanbury Bakery at the Witts Hill parade of shops appears to have closed after many years of serving the area.
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It's understood to have been shut since August 12.
A sign in the window addressed to customers thanks them for all their support and says "We are sorry to say the shop has had to close".
It's not known how long the baker's had been trading from its Witts Hill premises.
Bitterne Parker Ann MacGillivray said: "They provided a good service to the community".
She said she wasn't sure when it closed but "it had been there for years".