What does a typical tv programme owner e.g. a one hour long programme,
has to pay in terms of commission if he would like to use a
distributor to licence his programme to tv channels around the world.

Do you mean the commission that the distributor or agent receives as a
percentage of what the TV channel pays for using the programme?

Normally agents get paid for their successful efforts.  That is their
incentive and risk  - no results, no money.  But maybe they can insist
on a retainer for their services in some cases.

If you are suggesting that the "owner" of a programme pays to have it
broadcast, that is a touchy subject, since he must obviously have an
ulterior motive; the programme cost money, and then he is willing to
spend more to have it used.

Let me know, if this is what you mean.
Myoarin

Yes you are correct. I do mean the commission that the distributor or
agent receives as a percentage of what the TV channel pays for using
the programme. I am interested to know what the typical percentage is.

The programme owner does not pay anything to have his/her programme
broadcast. The programme is submitted to the commissioning editor of
the broadcasting company who will normally issue a standard licence.
An agent is used in some cases to contact various broadcasting
companies and sort out the 'Rights' which include how often the
programme may be shown, the period of showing (2 -7 years typically)
and any spin-off from the programme.
Agents will typically take a minimum of 10% which usually covers doing
the paperwork. If it is more than that by initiating the contact and
following through on any subsequent deals. In this case it could be as
high as 50%. This is covered by getting a better deal to start with,
and retaining more rights than the broadcaster may want.
Some programme owners submit the programme themselves and let the
agent do the paper work. Others leave it with the agent to deal with
entirely.
Some agents are able to get commissions - sell a progamme before it
has been made. Agents rarely work on the properties of one client, and
usually get a commission on sales. If they do work for one client then
they may require a retainer.