UA: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5
IP: 91.206.113.107
robots.txt: Yes
rDNS: No
ASN Name: PEOPLE-AS (123people Internetservices GmbH)
As a log entry just prior to this was from a search at www.123people.nl for which went to the same page, I assuming that it is their bot.