I used Waterworks in Sidcup / Blackfen, and though it got done eventually, i was very dissatisfied with the service i got, and wouldn't use them again.
I would recommend the guy who did ours; you have to take it to him and pick it up though and it cost £80 to do, but well worth it. He also advised us which rad to get. Will be using him again next year.
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Do it yourself you lazy sod!! : - )