I simply tried Googling "Michael Gemson" Tenerife and found someone with that name who is MD of Crown Leisure, a company dealing in amusement arcades and slot machines.
Looking into it further, it appears, from his year of birth, that Michael is 67. So far so good. Also, the address of his company is given as Penwortham, Preston!
So, two things that match the profile of Michael you gave.
You can check out the webpage I found this information on here.
I know there's no Tenerife connection, but I hope I've given you something to work on. You could try sending a letter to the Preston address.
If it's not the Michael you're after, I wish you luck with your continued search.
Dec 24, 2011 Rating
Update from your webmaster by: John
Hello again, Martin.
Further research has revealed that Michael retired in 2004. Seeing as you've heard of a Tenerife connection, this may be where he retired to.
You could still begin your enquiries with his old company.