So I have been using my 80D with the stock 18-55mm lense for around 6 months now.
I am really into outdoors/ countryside/ woodland photography and have recently got more into photographing people in the woods. I'm looking for a new lense that will give some variety to my shots, possibly with a longer zoom so I can get great depth from my images rather than having to be 10ft away all the time.
Quite happy to break the bank, or not.
Thanks in advance.
The 80D is more than just a beginner camera. That says something to me about you wanting to develop your interest in photography. The 80D is a fine performer and can go along way for you. At this time of thinking about upgrading lenses, maybe you should jump out of the beginner market.
Consider the Canon EF-S 10-22mm f/3.5-4.5 USM Lens for a wider point of view and one of the 150-600mm super zooms for the long end. Right now I like the Tamron SP 150-600mm f/5-6.3 Di VC USD G2 best but the Sigma C is very nice too.
Remember you did say, "Quite happy to break the bank, or not." However, these may be the cheapest way to go as you won't have to upgrade them ever again. If you stick in the "kit" lens level, you will. This means buying the same FL twice!
You can, and I would, upgrade the kit 18-55mm too. The EF-S 17-55mm f/2.8 IS USM Lens will do that nicely. Its very fast constant f2.8 aperture is a big plus.
The 10-18 is good for wide angle, but I think jumping to a 150-600 is a bit too much.
I think the the 18-135 is also something will look at. It will basically replace your 18-55 for a walking around lens.
I tend to agree a bit with both of the previous comments:
Ernie recommends a super wide angle lens - I think that range is his forte and it makes sense for woodland scenery.
I also agree with Kevin's suggestion of the EF-S 18-135 (USM or STM only) as a general purpose walk-around unit.
If you have a large bank then get the wide angle option - perhaps the EF-S 17-55 F2.8, and consider the Sigma 60-600 Sports lens. It's an amazing unit, just realize it's no lightweight but it covers this huge range extremely well see the review by Justin Abbott I have this unit and it does a great job. Woodlands tend to be darker so you will need to consider a decent, stable tripod.
If you are really into woodland photography, I would suggest following the work of Simon Baxter, who is an excellent specialis in this area. See this LINK