Just to confuse you, I went to
https://www.measuringworth.com and found the following.
If you want to compare the value of a £0 17s 6d Commodity in 1956 there are four choices. In 2018 the relative:
real price of that commodity is £21.45
labour value of that commodity is £49.51
income value of that commodity is £67.67
economic share of that commodity is £87.87
If you want to compare the value of a £0 17s 6d Income or Wealth , in 1956 there are four choices. In 2018 the relative:
real wage or real wealth value of that income or wealth is £21.45
labour earnings of that income or wealth is £49.51
relative income value of that income or wealth is £67.67
relative output value of that income or wealth is £87.87
If you want to compare the value of a £0 17s 6d Project in 1956 there are three choices. In 2018 the relative:
real cost of that project is £19.77
labour cost of that project is £49.51
economic cost of that project is £87.87
If that helps - good luck to you!