What to do with the middle room?

When we first looked at the plans for our new home, we were thinking of making the middle room a television room as we thought it might be a little dark.

In the end we decided to make it an extension of the hall, incorporating the downstairs WC and the 'hidden' cupboard under the stairs. The bead and butt wall panel we got from Ridgeonas 1220 x 2440mm. It was already primed £50.46