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We present ten new ultra-cool dwarfs in seven wide binary systems discoveredusing $\textit{Gaia}$ DR2 data, identified as part of our $\textit{Gaia}$Ultra-Cool Dwarf Sample project. The seven systems presented here include an L1companion to the G5 IV star HD 164507, an L1: companion to the V478 Lyr ABsystem, an L2 companion to the metal-poor K5 V star CD-28 8692, an M9 Vcompanion to the young variable K0 V star LT UMa, and three low-mass binariesconsisting of late Ms and early Ls. The HD 164507, CD-28 8692, V478 Lyr, and LTUMa systems are particularly important benchmarks, because the primaries arewell characterised and offer excellent constraints on the atmosphericparameters and ages of the companions. We find that the M8 V star 2MASSJ23253550+4608163 is $\sim$2.5 mag overluminous compared to M dwarfs of similarspectral type, but at the same time it does not exhibit obvious peculiaritiesin its near-infrared spectrum. Its overluminosity cannot be explained byunresolved binarity alone. Finally, we present an L1+L2 system with a projectedphysical separation of 959 au, making this the widest L+L binary currentlyknown.

The $\textit{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\textit{Gaia}$ DR2 ultra-cool dwarf