After replacing the hydraulic brake lines, it needed refilling and bleeding.
I've just done the fastest fill and bleed ever. It took about 5 minutes.
I used a 60ml syringe with a short length of tubing and filled it straight into the bleed nipple. There was still a bit of air in the system from somewhere but with some squeezing of the brake lever, I persuaded a few remaining bubbles up through the fluid reservoir. I've tywrapped the lever upto the bar to evict the last of it.