Hi
Can anyone give me some info on where the relay for the front fog lamps, of a Mk2b Punto, is located?
I've looked at Haynes manual, but it doesn't match with what is actually present in the car's bonnet

No idea. You should be able to hear it clicking (assuming it works) when you put power to the spots. Otherwise, it's sure to be a standard relay -- find by substitution?

Fuse box would be a good starting point before movoing on to the engine compartment.

Hmmm...exactly why I have a problem
The relay (according to Haynes - Punto 2003>) is supposed to be located in the engine compartment fusebox and feeds both front and rear fogs.
When I look in there first thing I notice is that layout is different from picture in Haynes. There are only 3 relays present and none seems have anything to do with fogs (70Amp relays...). The remainder of the sockets are empty.
I can't hear anything in either engine compartment or fuse box next to steering wheel (loads of relays there, but nothing jumps out at me). Owner's manual is no use at all.

I've trolled through my local scrap yard Punto's, and all Mk2's (no Mk2b or Mk3) have different layout to mine. I've only recently acquired the car, and fogs did not work from start (probably relay was faulty).

I need to know which socket it is supposed to be in, so I can either install new one or replace it. Fiat dealer is not an option at this time (flat broke)

Making the (big) assumption that they are wired in, pop a relay in each socket in turn.

The alternative is to trace the wiring back, maybe with an ohmeter with long leads.

Check also that it isn't something as silly as a blown fuse.