My car likes to be push started sometimes?

[shanhsv]

So yeah from time to time my car flat out wont start, it wont turn over,nothing. But give it a push and clutch start it and it works fine. Battery seems fine. I really dont understand why it does it, any1 got any ideas, immobiliser, dizzy maybe

[FstStig]

Starter motor or the Starter motor solenoid.

[Shambo]

Might sound weird but if you have 2 keys try the other one. The battery gets flat in the head and the imobiliser wont work. This is if you are turning key and have all lights but it wont turn over.
Mine was doing it for a while then is stopped. It was the key

[shanhsv]

Starter motor,Im doutful but i wouldnt be asking for help if i didnt need it. I may have to try the key first,needs replacing and way,and its a hell of a lot cheaper

[VrWagz1]

Flat out - explain, does it like try a little bit, does the starter solinoid engage, do you get reds, does the imobiliser light go out, is the battery shagged and its just goin flat??