Please don't forget that the SEVERN BRIDGE TOLLS only accept Cash in sterling. A car and trailer is approx £6.00 A van and trailer is approx £11.00 I'm pretty sure they don't accept any other currency and they definitely don't accept credit cards.
Also, beware of the speed camera's near the toll booths (50mph limit). There are often mobile speed camera's as you go down the long hill before the Pen-Coed junction and as Wayne's previously found out a permanent Camera on the Mumbles Road just after the Golf Course approx 3 miles before Mumbles.
There are also major road works between Newport and Cardiff which might cause some delays if you were intending to travel early Saturday!
I hope you all have a safe journey.
Mark