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Many many variables here, most would say you need to build by 10% a week or risk injury etc! But we're not talking massive distances here, so long as you don't mind being a bit sore the next day, take it easy on the pace, walk if you need a rest and are ok with making sure you eat and drink a bit on the run you'll be fine given is still LDN you are hardly going to be remote and stranded if you do need to bin it off! YMMV!
Ok stupid question incoming; newish trail runner here, doing a few 5kms, and the odd 10km. Feeling mostly ok on the 10km runs, but starting to feel relieved to finish towards the end.
I think I know the answer.