“As Matravers Tech would not be listed, this would suggest a discount to the P/E ratio should be applied” could you please explain the statement, how listing affect P/E ratio?
Listed shares are more easily traded than unlisted shares and will therefore have a higher share value (for otherwise identical companies) because shareholders know they will be able to sell them easily in the future if they want to.
So if Maltravers (wherever you found this question) is using the PE ratio of a similar quoted company to value its shares, then we need to reduce the PE ratio used so as to arrive at a lower share price than had it been quoted.