I definitely recognised him and was racking my brains as to where I'd seen him before but didn't make the DOND connection! Well done Nev!!

By my count, Nev is the third person to win what could reasonably be described as life-changing money on one show and then go and do it again on another one. Here's the full list:

Sarah Lang: £32,500 on In It To Win It (July 16 2005), £1,000,000 on PokerFace (July 10 and 16 2005). Also £600 on Wipeout (2001).
Clive Spate: £50,000 on Grand Slam (2003), £125,000 on Millionaire (March 27 2004). Also £9,050 on four other shows dating back to the 1980s, including Weakest Link (2001).
Paul 'Nev' Nevins: £41,000 on Deal or No Deal (September 14 2006), £75,000 on Millionaire (January 29 2008).

Other serial offenders worth mentioning:

Mark Kerr and Diane Hallagan: £250,000 on Millionaire (Hallagan on November 13 2001, Kerr on January 31 2004) and both later part of a team that split £40,052 on Come And Have A Go (late 2004). Also both won on 100% Gold in 1998.
Peter Lee: won £4,855 on four game show appearances (the first three in the early 80s, plus 100% Gold in 1999) before winning £500,000 on Millionaire (18 January 2000).
Kwan Loo: £100,000 on The Vault (June 19 2002), other wins totalling £27,200 including £16,000 on Millionaire.
Finley 'Fin' McLaughlin: £10,000 on Deal or No Deal (February 20 2006), £55,875 on 1 vs 100 (January 20 2007).
Dave Woollin: £20,000 on Deal or No Deal (January 7 2006), £15,000 on Are You Smarter Than A 10-Year-Old? (January 2008).

And one multiple appearance that's just pure comedy:

Paul Potts: £8,000 on My Kind Of Music (1999), £100,000 and a record deal on Britain's Got Talent (17-23 June 2007).

The US has (roughly speaking) a rule dictating a one-year gap between appearances on game shows. Throw that in here, and you get rid of McLaughlin, Lang, Spate and (perhaps pedantically) Lee. Make that two years, and you almost throw out Woollin (and he wouldn't have been on Bullseye and at least one other show in the interim) and you do throw out Nevins.

Duel has made a point of not casting serial contestants. I'd apply but I doubt the show will last long enough, and I suspect I'd feel very uncomfortable on that set.

I guess it brings us to the question who 'deserves' to go on any game shows and how many?
A bit like the question of whether they should have lots of not very well of folk on DOND or not.

Very true, alexandercbrown!

On a related note. Jim R was spotted on Small Talk from 1996 last night.

It's a fact Mastermind uses a 12 month rule to exclude anybody who have appeared on a television game/quiz show during that time. Pat Gibson was set to enter Mastermind 2004 but had to pull out due to winning his £1 million cheque.

That disasterous production from Fever (The People's Quiz) also used a rule for the audition stages that nobody could enter if they "won" on a TV show since 1st January 2006. However, it revealed that at the auditions a)not many were turning up and b)not many managed to answer ten consective questions.

This also meant that Nev (due to his £41K win in October 2006) and runner up Mark Labbett (who won £32K on Millionaire in spring 2006) were excluded to enter the competition. About three weeks later, Fever decided to remove the rule and invite anybody regardless how much they won recently.

The whole thing has been happening for donkey years with civillians appearing in other shows. Some companies go for the "experience" factor but some go for the "interest/back story" factor. Gallowgate's Duel is a classic example since they have been accepting game show "newbies".