You could try - very carefully! - Liberon Fine Wood Stripper (quite pricy but VERY effective on delicate timber) Available from good hardware stores or phone 01797 367555. Try a small hidden area first with a soft brush, then clean with 00 grade wire-wool dipped in white spirit. Good luck! For the oak top you could use water-washable Nitromors, followed by sanding with 240 grit (works for me) Surprised there aren't any reliable furniture restorers in Dorset, try looking on Web.