I will have to bite the bullet and do it this year, I bought some work about 7 years ago and prices are still the same, will wait until March and give it a go. 
WTF, how do you make it pay, 7 YEARS?


?
I increase my prices every two years, my customers expect it and understand that I also have bills to pay. Some go up by 50p others by £1 but they all go up.
Yes I do lose the odd one but if they don't like it, tough.
Beginning of last year diesel cost me £1.18ltr now it's £1.41ltr, Van insurance has gone up, liability has gone up, food, gas and all that has gone up and you can't be expected to stand those increases year on year.
If you do not increase prices fairly regularly then customers will moan and drop you when you get round to it. At the end of the day you are running a business not a charity.