Hi dolmadis
By 'inflation allowance', they are referring to indexation of the original purchase price for the purpose of calculation of CGT. The Government issues an inflation figure for each year, typically 2-3%. To suggest it would be 55% after ten years is optimistic
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So, on a £100,000 property, if the indexation were 2%pa over the ten years, the notional purchase price of the property would be £120,000.
lana