OK, here's the definitive answer from the horse's mouth (Peugeot!!)
for GTI6, which have had a bit of trouble with cambelts.
Up to build code 7358, replace at 27,000. Then at 60,000, then at
60,000 intervals.
These are the early cars and they should all have been done by now (or
broken). There are less than 500 of these.
From build code 7359 to 8147 replace at 36,000 (or 40,000 for the
extended service vehicles--after 1998  S reg) Then at 60,000, then at
60,000 intervals.
From 8148 replace at 60,000, then every 60,000.
The part number of the belt to use is 81698.

Build codes are put in three different places. Early cars are painted
on the top of the strut, usually N/S but I have seen them on the O/S.
Then they can be on a sticker behind the N/S strut, facing backwards
where the air goes into the heating system.
The latest cars have it on a sticker on the A piller close to the
interior light switch (O/S), or on the door below the lock.
Just use the first 4 numbers, and disregard the first number if it is
a zero.

Hope this is clear, and helps.