Car randomly wont start sometimes?

I have a ford ka that's 11years old runs perfectly when started.

At the minute it randomly doesn't want to start sometimes I manage to be it started by pressing the accelerator and only once has it refused completely. It starts but doesn't always fire straight away there is no pattern at all with it, the weather makes no odds.

But it allways seem to be first thing if its not going to start it will be first time, and then its fine for the rest of the day.

Its had the spark plugs changes and leads changes from the engine (I dont know the correct name for them) and ot gets a bottle of redex every few months put through.

Apart from not wanting to start sometimes the car is fine, any ideas?

Thanks in advance.

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