Help, my car wont start!

Help me please, I have a citroen ax spree 1994 mileage 117000. I cant get it to start, I have replaced the battery and ht leads and the coil pack.
The main problem is that the car wont start from cold at all, I can turn the key and the car trys to start but its not meeting with anything to fire it up, although if I bump it a few times it starts ok then whilst the engine is hot it runs fine, and can be started fine if left for any thing up to an hour. But if I leave it longer than that it wont start, it takes about an hour of bumping and jumping, (after I flatten the battery), before it fires up. Please could you advise me as to what else could be the problem, as I am now with out a car, thankyou!