What is the process for moving gas meter from floor unit to wall unit approx 80cm from current position and what is the cost?
You will have to contact Bulb, to start the process. There are limitation on where a meter can be moved, and Bulb would send someone out to survey the area, and if it is possible to move it to the area you want it.
It will come at a cost, to you. Bulb will not pay for this, I do not know how much that will cost, maybe someone else has had the experience. Bulb charges £120, for replacing prepayment meter to a credit meter, i suppose that is a starting point to guess the cost.