the cam failed because your head is starved of oil, its a very common problem on the 1.4. you need to clean inside the oil bar that covers the cam, and the oil pick up pipe that supplies that oil bar. its very important to ensure good oil circulation on the 1.4, if you dont then your new cam wont last very long at all.
best thing to do in my opinion is get a scrapyard head and fit it.
you can use the timing tools to set the timing, or ask a garage for a quote to fit the head, it should cost £150 for parts and labour (including new timing belt), then another £50 for the scrapyard head. job done for £200 and it adds value to the car.
when you get the car back and working the first thing to do is add 2 cans of engine flush to the engine oil and run it for 15 mins on a high idle. then drain old oil out, fit new oil filter and refill with a good quality 10w40 semi synthetic.