Thank you iFixit and Brittany for this guide. I was able to install a 1TB drive to replace the original 320GB that had failed. Luckily it would still work for a few hours before freezing so I was able to make a Mavericks USB installer and back up to an external Western Digital before it eventually stopped turning on at all.
Thanks for stocking all the items in the EU store as well. One thing I would mention is that as the spudger was not listed under the 'tools needed' section I forgot to buy one, luckily I bought one off Amazon which arrived after the iFixit package and before my hard drive replacement, but in the future it might be an idea to include it under tools needed.