I had 2 years free banking off Natwest then charges were like 80 a month so went on a fixed 25 quid a month arrangement.
Ian, invest five months of that £25 on membership of the Federation of Small Businesses.
Amongst other things (insurance against tax investigations and industrial tribunals, and many more), you'll get completely free business banking with the Co-op Bank (who have just bought 600 odd Lloyds branches).
Vin