You can really level 2 inches of fall in a wall especially as it must start very much thinner somewhere, ie run from 0 to 2 inches. This means that any infill would not be a standard depth and be likely to crack. For a good job we suggest taking off a few courses of the wall and rebuilding but keeping it level this time. Its ok to icrease the width of the joints as you go along the wall to pick one end up but dont overdo it. You need to take off a minimum of 5 courses increasing the bed joint by 10mm each time to pick up to 50mm at the end.
Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!