sounds good to me!
Easiest way to Collingham from Bristol way would be up M5, round M42, up A42 to the M1, take junction 25 (I think) onto A52, follow that under Nottingham and out the other side then follow signs to Newark then Collingham.
Probably.
Long old drive though.
About two and a half hours from Bristol to Derby at least then about 45 mins to an hour from Derby to Collingham, well that's how long it took me anyhow.