The others already said the most important: lots of fruits and vegetables, only whole foods (brown rice, whole wheat pasta, whole wheat cereals, such as weetabix and all-bran, ...).
I would like to add the importance of drinking at least 1.5 litres of water (3 pints or 6 glasses) everyday because fiber needs water to bulk and work properly
pulses are also very high in fiber...like lentils and chickpeas and beans. Also you can buy packs of high fibre bran/seed mixes that you can sprinkle on your cereal to increase the fibre content...maybe hit the health food store. Also you can take a supplement of slippery elm which you have as a drink with lots of water...that is VERY high!
Thanks 4 all the tips girls.., im going to hit the health food store tomo defo! I find now the fibre makes my digestion process much more regular and i do feel much fuller longer too xx