We are on BA15 in J in April booked a couple of week ago when a glut of availability for April briefly appeared. We want to book an onward flight to Wellington. There is one at 09:35 with QF. which is 4 hrs 15 mins after scheduled arrival time. I am relatively risk adverse when it comes to booking connecting flights for Avios bookings but think I prepared to risk booking this. Any thoughts on whether 4hrs 15 should be enough time?

We are traveling hand baggage only for the trip but had decided we would check it in on the way out to make life simpler at NCL, LHR and SIN, but now thinking we should not bother as presumably not having to pick up any luggage at SYD will slightly further de risk making our onward connection, or am I being overly cautious?