Thanks Marc, I appreciate your comments.
After a few months off due to family matters then poor weather, it was good to be under the night skies again, although much had been forgotten and I struggled with the set up.
In the end, all was good and importantly, I had a lot of fun.
In my 30 sec exposures (27th May) the asteroid trail was the hypotenuse of a triangle, with sides 30 pix and 50 pix, giving a trail length of approx. 58 pixels.
This works out at 1.93 pixels per second.
At an image scale of 0.364 arcsecs/pixel, the movement is then approx. 0.7 arcsec/pixel which ties in the value reported by The Sky X Pro.
Cheers
Dennis
EDIT:
Added an enlarged view of the 30 sec trail and some calculations to estimate the rate of movement.