equal pay on bank holiday

[saladc]

there are 5 sections at my work place, 4 of them get treble time on bank holidays, we only get double. we more or less do the same work even wen one of the other sections comes to work in our section he/she will get treble time while we get double, are we supposed to get equal pay even though our terms and conditions are different, also can we back date our claim

[dot.hawkes]

no
no
no