Posted about 9 months ago.
I thought it might be helpful for those who missed this earlier.
A great little online tool that helps you create proper passport size photos (for UK and other countries). If you have a printer at home then this works completely free (minus cost of ink and paper before anyone starts getting all technical on me).
If you don't have a printer at home then you can upload the passport photos you created on that site to tescophoto.com to get them printed and delivered to your local store for 15p.
Credit to ricoshay for posting it earlier