you state travel , wildlife and landscape so that helps with lens choices.
for landscape generally an UWA lens , wildlife well the bigger the better but a 300mm should suffice for a good start point. travel well that could cover anything inbetween.
for your budget probably APS-C would be the way to go as even SH FF is going to be pushing you at the limit.
i really dont think you could go far wrong with this
http://www.hdewcameras.co.uk/canon-eos-70d--18-135mm-stm-kit-1353-p.asp
a canon 70D with the excellent 18-135 STM lens. yes its a kit lens but its a step up from the standard, produces excellent quality images and makes a perfect travel lens too.
that would leave enough in the pot to get either the UWA 10-18 IS STM shown here
http://www.hdewcameras.co.uk/canon-ef-s-10-18mm-f45-56-is-stm-2339-p.asp
( i chose HDEW as they are UK based, excellent customer service, give 3 year warranty and probably about the cheapest new in the UK , you may find cheaper for lenses and body secondhand elsewhere such as MPB but buying new gives you that added protection and for a first time camera cant beat opening a brand new box )
if you wanted to make do with the 18-135 for landscapes then for wildlife you could hunt around and maybe find a half decent 70-300 ( the 55-250 IS STM is in budget if you got the kit as you would have around 265 left over and thats around £210 , leaving you a few quid for bag, a small tripod etc ). or maybe look at a 3rd party lens such as this do it all 18-270 tamron
http://www.hdewcameras.co.uk/tamron-af-18-270mm-f35--63-di-ii-vc-pzd-canon-2955-p.asp
combined with a 70D body only
http://www.hdewcameras.co.uk/canon-eos-70d-camera-body-1348-p.asp
which would bring you up around £785 ( still enough to get the UWA 10-18 ) or something else that suits