http://en.community.dell.com/support-forums/disk-drives/f/3534/p/17569879/17692865.aspx#17692865 says that the 2005 model came with OS and Driver discs. Just use that. By far the best and safest and cheapest solution.

http://www.ebay.nl/itm/Dell-Latitude-X1-Laptop-Factory-Restore-Recovery-Resource-Drivers-Discs-/300776912509?pt=UK_Computing_Other_Computing_Networking&hash=item4607b3767d says it sells a UK version of recovery discs.

http://server88-208-222-62.live-servers.net/en/dell-latitude-x1/ says they sell Windows disks (that require your existing license key) and driver disks, just in case you lost yours.

Use these last 2 resource at your own risk!

Kees