Assuming that your income is in excess of your basic rate tax allowance, then you will be slightly worse off as the 10% lower rate will be scrapped from april of next year...therefore, your 20% (was 22%) basic rate tax will kick in earlier!! therefore slightly more tax.
It does depend on your level of income. I work in the tax office and we worked out roughly what this change would mean if you are on about �15000 or under then you will be slightly worse off because of the 10% tax band being abolished.