I suggest reading through the reviews for these two recipes, to see which will be best for you (or to learn about any suggested tweaks to the recipes):
http://www.bbcgoodfood.com/recipes/1751649/yorkshire-parkin
http://www.bbcgoodfood.com/recipes/1940684/parkin
This might also be worth a look:
http://mummydeals.org/parkinpigsrecipe/
(If that page gets overlaid with a box inviting you to submit your email address, simply click outside the box to get rid of it).