Starter motor solenoid contacts a very likely culprit. A £16 (approx) kit available from a very good supplier on the bay of E - a Google search should locate easily. I had exactly these symptoms and the said kit cured it completely - now have reliable starting first time every time from a starter motor that has been on for 116K miles! The kit supplier makes the point that our starter motors are actually very strong and reliable, the only part usually failing being the solenoid contacts.
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