So you had a £100 aluminium frame for 3 years riding around London and it snapped? Not to be rude, but that sounds like a pretty good run for a basic frame
This.
Dolan frame aren't the best, and some does actually cracks (it been documented here in this topic) in similar place.
Just ditch it and buy another frame.
@fredtc started
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So you had a £100 aluminium frame for 3 years riding around London and it snapped? Not to be rude, but that sounds like a pretty good run for a basic frame