Can anyone identify this spider for me, please?
The spider on your ceiling looks like a sac spider, more a Cheiracanthiid (like a yellow sac spider) than a clubionid (a leafcurling sac spider).
But the colour contrast of the dark red thorax to yellow abdomen suggests it may be broad-faced sac spider, which a is actually classified closer to a wolf spider than to the above two sac spiders. It is considered non-aggressive and non-harmful to humans.
It is hard to tell from the photo whether the cephalothorax is actually red or just dark. So you are probably the best judge from here.
Compare what you saw to:

trachelas tranquillus (broad-faced sac spiders) https://bugguide.net/node/view/26291/bgimage?from=72
cheiracanthium (yellow sac spider) https://bugguide.net/node/view/3383/bgimage?from=0