If you want to make high-quality repairs that will serve you for a long time, then I advise you to first invest in high-quality building materials. This is really important and you shouldn’t skimp on it. But overpaying is not an option, so I recommend checking out MGN Builders Merchants www.mgnbm.co.uk/timbers-joinery/sheet-materials/plywood-sheets/ , where I recently bought plywood at a more than favorable price. It is also important for me that there is fast delivery of building materials.