I put not sure, only been going just over a year so feel it is too early for most, I am happy with most of my prices, I already put up some under priced work i had in Autumn. There are still odd ones which may get an increase if it starts to pee me off when doing them. I have not got a full round so I will just price new customers accordingly, i may even start adding extra for bi-monthly instead of monthly with the new ones.