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Gain is 230K - 150K - 30K = 50K, that is 25K each. Now knock of individuals' non cumulative Annual Exempt Amount (AEA), currently 12.3K, leaves 12.7K exposed to the tax at 18%or 28% or a combination of the two rates depending on he individuals' income including the gain in the tax year of disposal. A worst case scenario would be a tax bill of a tad over 3.5K.
You must advise HMRC within a month of the disposal date and pay the tax due, if any.