Ian,
I would agree with you that Chiddingstone has a super collection of not only swords, but armour as well.
You can spend a long time in the Japanese section, but if your down in Kent for the day, hop over to Maidstone Museum for part of it.
They also have a great collection of swords, armour, Etc,.
I feel sure Clive Sinclair, who is also down this way, can put more detail about both collections, but it was Victor Harris who first directed me to visit both and learn from just looking.
Regards
David