ModX Blog Articles RSS import

We are looking for someone to help fix a bug on our blog. The site is built on ModX and we are using the Articles plugin. We've previously employed someone from People Per Hour to import the RSS feed but sadly it's stopped working. We are looking for someone with experience of ModX and PHP.

The blog page can be viewed here: http://www.armstrongs-accountancy.co.uk/blog/
and the feed here: http://www.doc-safe.co.uk/servlet/com.scl.horus?service=desktop&function=external_accnews&acc=501&stylesheet=external_accnews.rss

I have attached the custom PHP script that should pull in the feed.

You'll see from the RSS feed the last two post have imported.