No advice I'm afraid but just to say it looks good

If you have heavy soil are you sure rolling it at all is a good idea?

I agree with steragram, although if the ground was well prepared before you had the turf laid it shouldn't need rolling anyway, all rolling does is compact the soil, and may level out very slight humps, Derek.

If it's just been done, then leave well alone until it's all settled. Compaction is the commonest reason for lawns in poor condition. Autumn top dress to level out any minor humps and bumps, and keep it watered. Nature isn't always too caring about the amounts of water she sends down, despite our efforts to please her.