Inshore lifeboat diverted from exercise at 2035 to report of small craft aground off Gillingham Strand, 2 persons onboard. ILB on scene at 2055, crewman from ILB walked across the mud to the craft, both persons cold and one very wet, having been in the water, Ambulance requested. With the assistance of Sheppey and Medway CRT, the two persons were assisted ashore to the ambulance. With no anchor and nothing to secure the craft to, the ILB managed to drag the craft into the water and secured to a mooring buoy. ILB was released and a very muddy crew and ILB returned to station at 2350, after a thorough wash down, the ILB was ready for service at 0100. Nthly 4/5.