you never know, sometimes a part you might think to be hugely expensive may turn out to be a fairly good price, the scary bit might be what is involved labor wise in fitting the bugger..
just had a look at pommy parts on ebay similar engine but smaller ??.... but for fiesta/fusion tdci .... 89 pounds , dunno what the $$$ conversion is , perhaps like temperature farenheit /celcius ..... double it and add 30
(ford probably wont be that cheap) + all your oils and any other bits and pieces needed + labor to do the job. .
good luck any way.