Not true. Monarch have the B scale, which was a productivity bonus in recognition of the arrival of the A300 and now A330 as well. The amount of people who get it varies as the fleet size of wide bodies does.
And as you know EGGW productivity scale (B Scale, fatboys pay whatever you call it) is based on seniority and has nothing to do with your fleet. (although by virtue of seniority wide body pilots are more likely to be on productivity pay).