We had a post-Lewisham registry office wedding picnic in the gardens of the Horniman museum. Everyone jumped on the 185 to get there. We had to hope it didn't rain too much, but in the end a sunny day and all went well. Cost £25 for the wedding photo permit for the gardens (note the word wedding in there.. its free to take photos otherwise). Also had a post-picnic booze and speeches at the All Inn One, the back stairs are good for providing a stage and we hired the venue for free. Paid for some food and drinks though.