Help Data Roaming Not Connecting

Hello. I am currently using the Galaxy Ace and have been doing so for over a year pretty much trouble free...until recently when my data roaming has suddenly stopped working. I have no issue connecting to wifi connections but my data roaming simply will not connect. I am using the three mobile network in the UK and have 'sent for data settings' only to encounter repeated failed installations of these configuration settings.

Has anyone else had a similar issue? Any help with this matter would be greatly appreciated.