Am I being underpaid?

[jldplumb]

I can't see you ever got an answer, sorry if I missed it.
It depends on you age minimum pay rates are here and note apprentice rate of £2.73 ph only applies if you are under 19 years of age.
https://www.gov.uk/national-minimum-wage-rates

Your employer must pay you at least these rates:
up to & including 20 years £5.13 ph
21+ £6.50 ph
no matter what job you do.

that 2.73ph applies to apprentices of all ages in their 1st year of training

 

[SJB]

£2.95 per hour for me as an apprentice, 118 quid a week, 10 long years ago