no, i've done a td to 300tdi conversion this summer. all we bought was the steve parker engine mounts (you can cut them off the donor disco, but was easier for us to have the ready made bracket) and the downpipe - this is a very simple bend so could be made up locally or by yourself if you can weld. everything else was modified from the td or from the disco - disco power steering pipes do just fit, but don't look as neat as standard, intercooler pipes can be made up with a combination of rubber and metal etc.
Some people like the steve parker kit as it's everything you need and gives a good looking install, others prefer to save money and modify what they have available to make it work.