The new derailleur system from Brompton is hit and miss tbh. Definitely go back to Sigma to fix this properly though.
I'll fix it myself, taking something back to someone who couldn't do it in the first place seems a bit counter-intuitive.
Guess if one is more competent than the original mechanic this make sense.
For me, as Sigma is supposedly be a high-end bike shop they should take responsibility & liability of fixing this issue.
@Dammit started
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The new derailleur system from Brompton is hit and miss tbh. Definitely go back to Sigma to fix this properly though.