I can recommend a few South of there, but not certain that you'll get any that far up North. Having said that, Tom Kirk from TK Helicopters travels regularly to maintain machines so he may entertain a visit - (especially as he is from North of the Borders himself.)
T K Helicopters - Chester (01244 880096)
Rotorspan - Droitwich (01905 345609)
Fast Helicopters - Shoreham (01273465389)
Joel