the jag owners manual are available online... have you searched at all? it pops up on google second from the top when i search for "jaguar owner information"

http://www.ownerinfo.jaguar.com/extf...prod/index.jsp

must be something about the seat there.
but failing that.. there are really only a couple of options.
if there is an extra button besides 1,2,3 (m?) then push that at the same time as the 1,2,3 to program it.
If there is no extra button, push and hold the 1,2,3 for a few seconds.... what else could it be?
have you tried anything? I would think that by trying a few things, you could figure it out faster than waiting for the rest of us!

 

here ya go.... From page 66 in the 2005 owner's manual for north america.

To store a driving position in the[align=left]memory:[/align][align=left]1. Adjust the seat and door mirrors to the[/align][align=left]desired positions.[/align][align=left]2. Push the memory button ‘M’ (see[/align][align=left]previous illustration). A chime will[/align][align=left]sound.[/align][align=left]3. Within 5 seconds of pushing the ‘M’[/align][align=left]button, push button ‘1’, ‘2’ or ‘3’ to[/align][align=left]memorise the configuration. A double[/align][align=left]chime will sound, and, if the ignition is[/align][align=left]ON, a message will be displayed in[/align][align=left]the message centre to indicate that[/align][align=left]the procedure was successful.[/align][align=left]By repeating these three steps and[/align][align=left]pressing the unused buttons, two more[/align][align=left]driving positions can be stored in the[/align][align=left]memory.[/align][align=left]To set a new driving position, adjust the[/align][align=left]driver’s seat and door mirrors and[/align][align=left]perform steps 2 and 3. The previous[/align][align=left]memory will be erased and the new[/align][align=left]position will be stored.[/align][align=left]Note: Button ‘M’ is concave, and there is[/align][align=left]a raised point on button ‘2’. This allows[/align]the buttons to be identified by touch.

 

additional info...

Recalling a memorised position

Ensure the gear selector lever is in

position ‘

Press and release the appropriate

memory button (‘

and door mirrors will move automatically

to the memorised position.

If the door mirror or seat position switches

are operated whilst the seat and door

mirrors are repositioning, the process will

be cancelled. Press the memory button

again to resume.

Note:

The memory function will only

operate if:

•

transmission only).

• Automatic transmission is set to ‘P’.