Somethings gone funny with my feed

Hi,

I wonder if anyone can help me, the feed for my blog https://www.dtsn.co.uk has gone a bit funny. You you look at it through feed validator it validates but it also seems to contain a lot of strange information, like the HTML code for the first timer plugin (line 27). Also it contains all the javascript for Google Analytics. I don’t know how the feed creator works in wordpress but mine looks like it scrapping the contents after it’s outputted instead of taking the post/title/category and passing that into a feed.

Thanks

Daniel