The best way by far is word of mouth recommendation, especially useful if the plumber is local to your area and can be called upon in an emergency. Good trades are kept busy by recommendations and often will not need to advertise, so bear this in mind and ask around.
Searching online can be invaluable when looking for a good plumber in the city. There are many more to choose from and you will also be able to see what comments people have made regarding the quality of the workmanship and value for money. Many forums exist to answer any questions you have regarding a particular company, which can be worth checking out.
Any search, online or otherwise, should be focused on your location within the city as it may have a bearing on the speed of call out. It may be possible for a nearby plumber to fix your emergency between other jobs. Saved time in terms of journey should also have a bearing on price.
Make sure that the company you choose has the professional credentials required to carry out work, particularly where this may apply to gas central heating systems. In a rush you'll only be able to get verbal quotes so check on things like emergency call out fees. Otherwise make sure all quotes are in writing.
Most important of all is to never pay cash up front. Payment should be made on satisfactory completion of all works, following which be sure to pass on the recommendation to others of a emergency plumbing job done well.
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