Sanderskn, I would begin by going to Hever Castle first. Hever Castle is located in the village of Hever, Kent, near
Edenbridge, 30 miles (48 km) south-east of London, so it is not far from London. How to get to Hever Castle (from their website): trains run from London Victoria and London Bridge (via Oxted or East Croydon) to Edenbridge Town Station; then take a taxi for three miles to the castle. Relyon Taxis are near the station, telephone 01732 863800, or call Edenbridge Cars on 01732 864009. Suggest that you book a taxi in advance. Hever Station (next on line, unmanned and no taxis) is a one-mile rural walk to the castle. If you are in good shape, the one mile walk would not be difficult. If you have your mother with you, the first option would be better; to take a taxi. There are no regular bus services to Hever Castle from either station.
When you get finished at Hever Castle, you would want to journey on to Maidstone. You may want to stay at a B&B a in Maidstone and go out to Leeds Castle from there. From Leeds Castle's website: By Train: Southeastern runs frequent services from Maidstone to and from Bearsted and a coach shuttle service run by Spot Travel is available from the station from March to October. Taxis are also available. By bus: catch the Number 13 bus from the Chequers center in Maidstone. Takes about half an hour, stops right at Leeds Castle parking lot.
When you are finished with Leeds Castle, you are not very far from Canterbury to the east. Return to Maidstone train station; there are trains directly from there to Canterbury. Look at this site for trains: http://ojp.nationalrail.co.uk/service/timesandfares/MDE/CBW/today/0622/dep
How long to stay in that area is up to you. It would be possible, if you get an early start from London, to get to Hever Castle and Leeds Castle in the same day. At the end of that day, you could travel to Canterbury and spend the night there. Wake up the next morning, see all that you want to of Canterbury, then hop a train from Canterbury to London.
With this plan, you would be spending 2 days and one night in Kent, away from London.
Now, let me address the subject of spending several days in Kent. Near Hever Castle there are many other things to see. Near Hever is Chartwell, at one time, country home of Winston Churchill. Staying in this area, I would either stay at a B&B in Edenbridge or at Hever Castle itself. Yes, they have rooms there. Talk about a stay you will never forget:
http://www.hevercastle.co.uk/holiday-lets-kent.aspx
Edenbridge has the train running through, and also the aforementioned taxis, which will come in handy. To the east of Edenbridge, is Sevenoaks, where you will find the historic Knole and Ightham Mote, both well worth your time. One could find a B&B in Sevenoaks; pretty centrally located.
http://www.nationaltrust.org.uk/article-1356401237618/
Now, let's throw in Sissinghurst. Sissinghurst's nearest train station is Staplehurst. I recommend, if you stay nearby:
Sissinghurst Castle Farmhouse, Biddenden Road, Cranbrook, TN17 2AB
Doubles from £100.00 per night
Contact Sue and Frazer Thompson
Telephone 01580 720992
sissinghurstcastlefarmhouse.com
[email protected]