According to this random review I just Googled for you:
http://www.vectorbd.com/peugeot/arch.../Mar/0002.html
Quote:
Industry-standard Isofix anchorages are provided in the rear for
compatible forward-facing child seats, although the 307 has joined a
growing list of test cars whose rear seatbelts aren't long enough to
circumnavigate my daughter's European-designed rear-facing child
seat.
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Seems like your all set.