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@Jonny69
Bit of local heat might actually do it good. It’ll take out the temper which will lower its ultimate strength, but at the same time it’ll improve its fatigue resistance.
I didn’t realise this had a fine braze. I think MIG is going to get a bit messy near that braze line, plus to my eye it does look a bit like the crack runs over the braze over the bottom bracket, which is probably where it initiated. I’d normally get stuck in with the MIG but I think because it’s a nice frame you can probably save it if you can find a skilled welder to do what @Dogtemple said. Basically vee the crack out, TIG close up to the braze line, drill another small hole at the end of the weld, then brass on the last bit, over the hole and melt along the crack in the braze line.