Original stairs bannister existing from the 1980's. Its of a design of that era. It has metal uprights, with horizontal wooden pieces that act as protection from falls. I believe that if i was to remove this bannister, and fit a replacement. Any work carried out would be required to be at the 2012 Building Regulations standards, instead of those from the 1980's era. Could this work be carried out DIY? Would i need to nofify building control? Do i need any structual calculations to be made, in regards to the top rail force to take 40kg per metre.? I notice that alot of information about Part K on a few stairs websites, but nothing on the likes of ebay sellers etc.