Why would you stick with one bookmaker though? You signed up because of a bonus or offer, no problem there, but there are so many bonuses to claim at other bookmakers you should just repeat the process instead of being a creature of habit.
Being a sluttly bookmaker user is far more profitable than sticking with the same one. Use them, abuse the bonuses, and move on.
There are over 100 that you can use as a UK customer. You might not have heard of most of them, but that doesn't mean they aren't reputable. The Gambling Times has a great bookmaker review page, but I've selected 5 here that you might not have heard of our used, but will give you a bonus and some extra value on your bets.
Run really profitable horse and football promotions, along with a risk free sign up bonus.
Great sign up bonus and a history of regular promotions, you can't fail to win money here right up to the point where your account gets limited!
Until the end of may you can get a £138 sign up bonus exclusively from The Gambling Times, and then a £38 reload as well.
Nice sign up bonus, but worth using just for the amount of football matches where they offer double and treble odds where your first goalscorer goes on to get a brace or hat-trick.
They share odds with other sites, but you can still claim the bonus so it's worth having an account here
Don't stick to the one you started with, it's not going to give you the best chance of turning a profit. Whether you're mugging, or matched betting, you should be using a different one for each of your bets until you run out of new ones to use!