Hi Stuart,
First of all: the workflow works very well, thank you for it. What would make it even better though is the integration of some other lastpass features as were found in the now obsolete LastPass Vault Manager: http://www.alfredforum.com/topic/5293-lp-vault-manager-a-workflow-for-lastpass/?page=3#comment-47967
What I most miss:
launch a vault URL in the default browser.
copy a vault item’s username.
generate random passwords.
Thanks,
Thomas