Anyone have any experience with making domestic to international connections at OSL airport?

We're supposed to fly from TOS to OSL to LHR. Supposed to get into OSL at 3:50 and depart for LHR at 5:10. I know we have to switch from domestic to international and that can be a bit of a walk and we have to go through security again. We won't have any bags.

Anyone know if this is practical?