New Sensory Garden - Can you help?

Our school is building a sensory garden.  We want to do this for all of our children but in particular a few children who have a specific need or condition which means they need some respite from the main playground.  Glaxo Smith Kline are sending a community working party who have offered to complete the digging, pruning and preparing but we do need some donations. We are asking local companies and have posted on freecycle but thought you are parents, friends and governors may like to help.

We need any good quality; raised beds, top soil, shingle, soil, wood to make beds, We are also looking for herbs and plants to use in the garden which later on will be used in the kitchen of our school to demonstrate food to fork. 

Can you help?