Nat have a look on the Millets website. They have a selection of poles from around £10 upwards and there is one in Yeovil. They also have a good selection of rucksacs. I can recommend the Berghaus Freeflow as it has a good mesh system that keeps the bag off of the back. They do a ladies version in 30 litre size which would probably do for you, but have a try of one first as what suits one person is not always good for another.
Peace , Lubin.