Check out the breads you're eating, there are some Helgas and Vogel's breads that have stacks of fibre!
Cauliflower has heaps too - 100g of frozen cauli has 3.7g fibre and only 93kJ!
Switch white pasta which has 585kJ and 2g fibre, for wholemeal which has 540kJ and 5.5g fibre!
Also look at your brekkie cereal, All Bran isn't the only option!! Vogel's Soy & Linseed Ultra Bran has 594kJ and 14g fibre per 45g serve and is really delicious!
I went through the same thing myself a while back, once ya start experimenting with a few things and change your grains around and stuff, it's easy to get your 25-30g per day
Sarah's right about the water though, drink loads or you will be allll blocked up
Sorry for babbling, hope it helped tho!