Tubsy,
I've been able to shave off -0.5 dipoters from my prescription in 4 months or so using the advise found here on these pages and other sites on the net. Do a search for Magoo, his posts have good tips on what to do. Mind you, I was at -3.5 + astigmatism but nonetheless changing my visual habits ( mainly when doing close work) has really helped.
The prescription I got just after Christmas feels too strong at the moment which makes me think I might have shaved another -0.5 off.
Great!
Regards
Cosmo