Yet another abortive through trip from Cwm Dwr to OFD1. The problems started after the Cwm Dwr boulder choke where we spent a very long time trying to find the route from cwm dwr to the OFD stream. Eventually we found the confluence but we had taken so long to get here that to continue through to OFD1 would have taken us over our call-out. We decided to turn back. Route finding on the way out wasn't too much of a problem.