Yes they will publish articles. Most of the trip report articles are not by staff writers, but submitted from the public.
As IO540 says they aren't interested in articles that are very technical if it's a trip report. An technical article in itself probably would be of interest, but the trip report ones should be more inspirational rather than a "hot to do this" type article.
Photographs are very very important to the article. If you have a great text but few good photos then the article is unlikely to be accepted.
Some magazines have a "house style" to the text. For example how they want numbers formatted etc. If they do it's probably written on their website. Make sure that it correct before submitting.
They pay in the region of £200-£250 for accepted articles. It's a few years since I wrote anything so can't remember exactly, and it might be out of date.
It will also be many months before it will be published (if they decide to).
If you want to write something other than a trip report, call them up before writing and ask them if they'd have any interest in such an article. You might save yourself a lot of work if they are not, or they might point you in a slightly different direction to make it more likely to be accepted.