“the court must, unless it considers it unjust to do so, order that the claimant is entitled to – (a) interest on the whole or part of any sum of money (excluding interest) awarded, at a rate not exceeding 10% above base rate for some or all of the period starting with the date on which the relevant period expired; (b) costs … on the indemnity basis from the date on which the relevant period expired; (c) interest on those costs at a rate not exceeding 10% above base rate; and (d) … an additional amount, which shall not exceed£75,000 ...”