Aylesbury or Salisbury?

Last week I visited, rather naively two Ailesburys, without knowing whether they origniated from the original place or not. Why has the road not been spelt correctly? Why is it not rationalised with the common spelling? I asked the same question about it and this week have looked in various places to find out.
My initial research into the place found this snippet of information.

"Old English words, such as burh "fortified place", were occasionally added to Celtic names in the same way. Thus the Romano- British form of Salisbury (Wiltshire) was Sorviodunum. The earliest forms of Salisbury refer to Old Sarum but, when the move to the present town took place, the old name was retained. The meaning of the first element of the Celtic name is unknown, but the second means 'fort'. When the name was borrowed, this second element was repleaced by Old English burh a word having a similar sense, and it has early forms such as Searobyrg and Searesbyrig. the latter is however the one which has survived, but a change of the first r to l took place due to Anglo - Norman influence, hence the modern Salisbury. The present form of Old Sarum itself is due to a mistake. In medieval documents it normally appears in the Latinized form Saresburiensis, often abbreviated. The abbreviation used for -resburiensis was the same as that often used in Latin for -rum."

Kenneth Cameron (1961), English place names, (London, Batsford (1977) p36.

So, could it be from the change in letter in the word and the abbreviation that the Ailsbury emerged from Salisbury? I thought it unlikely, so looked online to find out more about the history of the roads themselves. Ailesbury Close revealed little, Ailesbury Way did in this site.
This simply says "Ailesbury Way , After the Marquis. The spelling is correct in this context".
Now, who was the Marquis of Ailesbury?, well there have been lots of them and they used to own lots of land in and around Burbage, up to 37,993 acres, and taken Marbles from greek temples, (another one of their titles was Earl of Elgin). The Marquesses of Ailesbury got their title from the Earls of Ailesbury, who had their title since 1664, after the Protectorship of Oliver Cromwell, land was re-allocated. Now the important stuff, where did the tile 'of Ailesbury 'come from? Well it turn out it is from Aylesbury, Buckinghamshire, like all the others. The original Earl of Ailesbury lived in Ampthill, near Aylesbury. Incidentally the earliest "of Aylesbury" I could find was from 1188, a David de Ailesburi from Lipscomb, (1831) History and Antiquities of the county of Buckingham, Vol 1 p244.
In 1182 he helped with the prison, by repairing it, very helpful chap!
Therefore, the Ailesbury Close of Chippenham and the Ailesbury Way of Burbage are safely Aylesbury, by a different spelling, from the Marquess who used to own the place, who had taken his title from Aylesbury originally. They still have a lot more in relation to Aylesbury than previous Aylesburys, however.