Still thinking solenoid ...or maybe ignition switch (the thing your key goes in) otherwise
Certainly I would not go randomly guessing and buying parts (such as a starter motor).
Yes I think you need an auto electrician.

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Mike

Thanks
I'll get an auto electrician to look at it.

But if I hear a click coming from the engine/Starter area when I turn the key, wouldn't that eliminate an ignition switch problem?