Slaithwaite

What a wonderful name! Don't ask how to pronounce it; I've already come across three totally different versions. 
Looking into family history, it would seem that several of my ancestors once lived there; in the Colne valley..

I have no intention of boring anyone with people; I'm confining myself to writing about places.

Looking thro' old newspapers online, I came across

GAS
On Thursday evening week Slaithwaite was lighted up with gas in the streets of the first time. The lamp-posts were erected by subscription, and a rate will be levied on the ratepayers to defray the expenses. 
Leeds Intelligence 23 January 1858

Nearby villages include Almondbury and this is where a coincidence can be found between the Yorks., Derbyshire and Lancs. sides of the family.

Almondbury has Castle Hill

which dominates the surrounding area. 

In the Middle Ages there was a castle on the hill, of which the well remains. The present tower was built to commemorate Queen Victoria’s Diamond Jubilee of 1897. Although the erection of a tower had been discussed years earlier, to mark the achievements of the Duke of Wellington.

The Lancs. family lived in Clitheroe, Pendle Hill country. 

In Derbyshire the hill landmarks are Kinder and Lantern Pike. 

Former Clough Lane mill at the foot of Lantern Pike.

The next series of coincidences is occupations. 
All the branches of the family tree have some connection to mill work.
Lancs. cotton
Yorks. wool
Derbyshire cotton mill and paper mills