You should have tailored your application more towards your strengths. If you had applied to Barts and Newcastle this year, you would have gotten guaranteed interviews (due to your UKCAT). Nottingham and Southampton are very risky choices, and applying to Sheffield with a UKCAT of only 690 is quite a silly move as it wasn't much below that last year.
You need to improve by applying to appropriate universities and improving your personal statement - these are your weaknesses. If you reapply and use the resources available to you on TSR, you have every chance of getting an interview for 2012 entry. I wouldn't recommend studying abroad under any circumstances, and using GEM as a back-up (even as a reapplicant) isn't a particularly clever move. Do you have a genuine interest in neuroscience? It's going to be difficult to motivate yourself in a degree which you're not really that passionate about when the chances of actually getting a place in a graduate-entry medicine scheme at the end of it are extremely slim.
In summary, as Helenia said, reapplying again is the lesser of three evils.