and a third actor from X-Men.
http://www.imdb.com/name/nm0629570/

We're gonna need birth years.

I just checked Ivanhoe, he's credited as David J. Nicholls in episodes 2, 3, 4, 5, 6.
Not sure if it's him or this other : http://www.imdb.com/name/nm0629574/

Not sure of this actor because IMDb name is also CLT's favorite (David), but IMDb roles seems more often credited as Dave....

CLT results are:
Dave Nicholls: 15/95
David Nicholls: 36/269 (also Imdb common name)

imdb

Dave Nicholls 7 confirmed (CLT) 15/95
Gangs of New York
Gladiator
Jack and the Beanstalk
The Long Firm (ep 4)
New tricks (season 2 ep 7)
The Parole Officer
Queer as Folk (season 2 ep 2)

David Nicholls 4 confirmed, 2 unconfirmed (CLT) 36/269
Band of Gold (TV series)
Crush
GBH (TV series)
Highlander: Endgame
Muppet Treasure Island
Wycliffe (season 4 ep 7)

David J. Nicholls 1 confirmed(CLT) 7/10 (maybe it's not the same)
Ivanhoe (ep. 2,3,4,5,6)

David Nichols 1 confirmed(CLT) 70/455 (maybe it's not the same)
The New Avengers (season 2 ep 10)

And there's another David, Writer : imdb
In CLT under David Nicholls : And When Did You Last See Your Father?, Cold Feet, One day, Shakespeare Retold, Simpatico, Starter for 10, Tess of the d'Urbervilles

And a third, Dave Nichols sometimes credited Dave Nicholls : imdb
In CLT under Dave Nicholls : Best, Bridge of Dragons

And a fourth, David J. Nichols, sometimes credited David J. Nicholls.

It seems that user "baham" hasn't been here since 2018, so I'm taking the liberty to update this list:

DAVE NICHOLLS (9 titles, 9 confirmed)
- Gangs of New York (confirmed by baham)
- Gladiator (confirmed by baham)
- The Governor: The Complete First Series (confirmed by Gamemaster)
- The Governor: The Complete Second Series (confirmed by Gamemaster)
- Jack and the Beanstalk: The Real Story (confirmed by baham)
- The Long Firm (confirmed by baham)
- New Tricks: Series 2 (confirmed by baham)
- The Parole Officer (confirmed by baham)
- Queer as Folk: Series 2 (confirmed by baham)

DAVID NICHOLLS (9 titles, 9 confirmed)
- Coogan's Run (confirmed by Gamemaster)
- Crush (confirmed by baham)
- GBH (confirmed by Gamemaster)
- Gold: Series Three (confirmed by Gamemaster)
- Heartbeat: The Complete Eighth Series (confirmed by T!M)
- Highlander: Endgame (confirmed by baham)
- The Missing Postman (confirmed by T!M)
- Muppet Treasure Island (confirmed by baham)
- Wycliffe: Series Four (confirmed by baham)

DAVID J. NICHOLLS (5 titles, 4 confirmed)
- Band of Gold: Series One (confirmed by baham)
- Birds of a Feather: The Complete Sixth Series (confirmed by T!M)
- The Detectives: The Complete Second Series (confirmed by T!M)
- Ivanhoe (confirmed by baham)
- Wycliffe: The Complete First Series

DAVID J NICHOLLS (3 titles, 2 confirmed)
- Jack & Sarah (confirmed by T!M)
- A Touch of Frost: Series 6 (confirmed by T!M)
- Waiting for God: The Complete Third Series

DAVID J NICHOLS (2 titles, 0 confirmed)
- A spasso nel tempo - L'avventura continua
- The Wedding Gift

I've previously mentioned an appearance in 'The New Avengers', but that's decidedly not this actor.

For now, it's a tie between David and Dave, with nine titles for each, in which case the larger number of profiles breaks the tie. The huge amounts profiles for both 'Gangs of New York' and 'The Gladiator' swings this towards Dave Nicholls.

Quoting Gamemaster:

Quote:
The Governor: The Complete Second Series --> Dave Nicholls

The last title is not yet in CLT but it's in the database with EAN 5027626372248.

I've submitted a full set of cast into this profle, and have updated the list.