I burnt my right calf in 2 places (mid pegs) on Friday when the outside air temp was 36degC, the rear guard was the culprit...which gasket sealant did you use, I think some have a higher temp rating than others? Going to adapt to this method once I have the right materials down.
Its a T25 torx bit required to remove the 3 heat shields from the header. They are threadlocked so if you have not got replacement screws from Triumph, apply some High temp threadlock when reassenbling and tighten to 5Nm.