fiesta lazy starter?

Ihave an old p reg fiesta when I start it the starter sounds lazy as if the batteries flat turn the ignition off and back on it starts first time as normal ,starter kicks in straight away? today I parked it up went back to start it ....nothing all dash lights were on as normal,anyway ended up towing it to get it started got back home (about a mile an half away) turned ignition off sat there for five mins tried it again and it started ok. could the starter be on its way out or does it need a bit of wd40 squirtin in it?

Pete
March 2013