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@TheBrick(Tommy)
Don't know anything about it but a propane torch from b&q would work.
For something a bit better which would get the metal up to temp quicker and hence be easier to use a mapp torch could be used, also avalible from b&q.
I would go with the mapp because you want to make sure the head tube was well up to temp to allow the filler to flow fully in.
Sounds good though document how it goes.