I have a 2001 206 cc and I used mobil 1 for the first 4 years and then changed to Castrol edge 0-30W and have had no issues, but its probably a bit overkill. Just get a filter from halford, Partco. I do not think it makes much difference what filter you use so long as it fits!
Peugeot recommend Total Quartz 9000 which is a 5/40 synthetic oil. It is only £16+VAT(£26 ish from the dealer) from GSF's genuine oil filter can be bought from Euro Car parts for peanuts too...