Hello I am just wondering if we should book for one way going to London this December since our visa just got approved, my husband was thinking of just one way, will this be fine? Or we should just book round trip ticket. Any thoughts? please. Thank you.

Also, one more question my son has his visa too but my parents my sons grand mother in particular insist that he finish his school year here in the Philippines which I agreed, so I will go to London this December and come back for my son this march and we go to London together for good, will there be any problem with that? My visa and my sons visa validity is October 15, is there any rule that say we should fly to London not later than 3 months, my husband said he read it in a forum somewhere, any help? Thank you.