Old computer equipment can be difficult to dispose of, but there are a number of organisations that can recycle components and in some instances upgrade equipment, for commercial or even charitable use. One local company is Chiltern IT in Gerrards Cross, you will find their website link below.
When disposing of old computers, it is important to remember that data on hard drive disks should be removed. There are a number of tools that will remove data from a hard drive, some are even free. A personal preference is Eraser which boasts a wide variety of file deletion methods. You will find the link to download Eraser below.