I use Autostitch for most image joining things, however it has some foibles - if the images are too dissimilar you need to relax the settings, quite easy to tweak, really
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock