thanks for your help and sorry for this late reply. Just to clarify for everyone on this forum that I got the sub-3.30 plan from Pablobones' link above. However, the link is to Waybackmachine, one of those wonderful websites which store old webpages and has actually a record of all the Garmin training plans which were on RW. So, if you're looking for one and can't find it, just have a look there.
Apparently, they're going to put them up again soon. I also then decided to subscribe to the website. They've got good, cheap deals and the plans for specific times which fall under subscriber's content are very, very similar. Practically the same, I would say, but they don't go with the Garmin.