On closer inspection I found two more chips... but one is quite deep and down to the metal... I've decided to respray the whole bonnet. Lacquer and paint are setting me back £80. Filling won't be any good its too deep and will be quite noticable.
Tried another technique off the net... fill with paint then superglue on top and then cover with foil and heat with hair dryer... not good enough for me.
Bumpers I can live with... thats plastic and won't rust but I know I have to move fast as it rained last night!
Cheers guys