Writing to you from Agra, India.... I went the most direct route possible (more or less) from UK to India... Going through France, Germany, Austria, Hungary, Romania, Bulgaria, Turkey, Iran, Pakistan, India.... The specific routes through their are really upto but are very accesible (Pakistan exception.... and a few potential complications in Iran, as in a few more politically sensitive areas were overlanders have been hassled by cops.)
The route for Pakistan is nearly completley dictated to you at the moment.... Apparetly Taftan border IS open... The route dicated to me was Taftan Border (I stayed in Zahedan, crossed and stayed in Dalbandin), Quetta, Sukkur, Bahwalpur, Multan, Lahore....
Cant tell you about the stans/north pak, as i didnt go that route......
Any specific questions id be happy to give my experiences