Okay, an update. I've now had three nights straight of four-hourly night-time sleeps from DS, (was 2-3 hourly) and the only thing we've done differently has been to swaddle him in a bunny rug. The trick for us is that we have to wait for him to fall asleep, then swaddle him - if he's awake when we swaddle, he stays awake trying to fight his way out.

If it works, it works really well. He's generally not fighting his way out until he's woken up for a feed. PLUS, I'm now able to unwrap him if I need him to wake up for a nappy-change or a feed - within minutes he wakes up with no more prodding from Mumma.

So...our swaddling seems to be working but I just need to decide whether to invest in a swaddle wrap/woombie or continue with the bunny rug. Will see how we go.

Thanks ladies!