Bob Bolton is correct in all he says about tuning the reeds down. Most of the unwanted effects of retuning a reed can be cured if you fiddle around with them long enough, but unless you're capable of doing this yourself then the time involved will be costly. As a novice at the re-tuning game it took me about 16 hours work to retune a 48 button english from A=456 to A=440; plus a couple of hours since to fine fettle a few of the reeds.

Scott