We fly right seat quite a bit at the moment (less now we are hiring new FO's) and as said above we have to do a small RH seat check at the end of every sim. session to maintain the tick in the box. Although the CAA are happy to let us operate as PF the company policy is that we only operate as PNF when in the RH seat unless you are a trainer. We normally get round that by swapping seats half way through the day on a multi sector trip so we both get some landings, the company leaves it to us to nominate who is going to be in command of each flight and how we share out the flying.