Really impressed with the Veritas clamp I just bought from Axminster.
I recommend it to anyone (esp. newbs like me) who wants to glue up before pinning.
Unlike band clamps (well at least the cheap-ish Stanley one I've got), the Veritas gives precise control over the corners. You can see exactly what’s going on, and easily make adjustments without throwing the other 3 corners out of whack.
£30 very well spent.