The whole area I want covered is 7m by 6m. How many bags of gravel would I need if the bags are 25kg and are £2.98? That is the cheapest gravel I have seen in a local DIY store. I called a local gardener and he said he would do the job for £150, that is including all the necessary bits and pieces, including membrane or weed controlling fabric he needs to lay first. So what is the cheaper option for me?
I would go with the local gardener. I would however ask him to give me an itemized bill to pay him or her from. That way you are sure what you are paying for and the gardener is too, so no nasty disputes to deal with if you do not get something you wanted done. I use gravel mulch in my rose beds. Laying down the fabric is truly a must to avoid most weed and grass problems. Usually most gardeners know where to get the gravel they need in bulk from a supply yard. Buying it by the bag is way too costly if you have a large area to do.