Thanks Rick, Neil and Hooked-Up
I only just bought the line and couldn't see any kind of manufacturing dates on the packaging. I also checked the guides which don't seem to have any defects.
Yes, I don't thinking I was cutting the tag ends very short so I'll have to improve in that area. Browsing online it seems like some people use nail clippers which might be better than what I was using. When tying the knots I've been wetting them but will need to the double check the tightness and that they have formed correctly.
The last lure I lost, I am pretty sure I did use a shorter leader and from memory it was sitting just off the reel. However, I tied the leader knot under torchlight in the dark and it was the first time tying it, so I guess that could have been the reason there.
Will head out there again after practicing my knots and with a shorter leader for sure.
Unfortunately, and I didn't mention this in my original post but the other thing I did was to accidentally crush my rod in the front door when I got home! What a rookie mistake! Not sure if I can get a replacement top half piece (as it is a two piece rod). The rod is intact but the tubing has been split for about an inch and a half or so. If not, I guess I'll probably have to bite the bullet, get a new one and put it down to a learning experience.
Thanks, for all of your help.