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Following the collapse of the Mt. Gox cryptocurrency exchange in 2014, many users had their Bitcoin holdings locked on the platform. Recently, after years of legal proceedings, some users received partial distributions, recovering only a portion of their original holdings while the rest remain permanently unrecoverable. For example, a user who originally purchased 20 BTC at $30 each and received 4 BTC in the court distribution is left with 16 BTC deemed lost. For UK CGT purposes, would the user be able to claim the capital loss based on the market value of the 16 BTC at the time of the court distribution (when the loss was crystallized), or is the loss limited to the original purchase cost of $30 per BTC? Would negligible value claim rules apply in this scenario to use the market value at the time the loss became concrete?