Help with headlining please

[malcolm]

Still waiting to pick up my series 2 2+2, but should be getting it this coming week. I know the headlining is saggy, but I also know that I'll mess things up if I try to replace it! Does anyone know a good (but hopefully reasonably priced) trimmer in the Essex area, preferably near chelmsford? I've found a few online of course, but personal experience is normally best.
Help would be appreciated.