Three For The Cost Of Two -- Coming in to land during carrier trials , with the Royal Navy is a Short Seamew, Britain's newest anti-submarine aircraft. The Seamew, which goes into service with RAF Coastal Command this month and with the Royal Navy later In the year, has been designed for rapid and cheap production and it is estimated that three can be provided for the cost of two other aircraft of similar type. The plane, now in full production at Short's Belfast works, can dive at 325 knots, ha