periodically

The £50 payment is separate to Nationwide's so-called fairer share payments scheme, which periodically returns some of its profits to members.

Such visa-holders must leave the US periodically to have their visas stamped in a US embassy abroad.

But throngs of them wearing crisp uniforms and bristling with weaponry have been a prominent feature at hostage-handover ceremonies that have been periodically taking place since the cease-fire began last month.

They will be updated periodically as officials complete their work.

He'd even periodically put up pictures of a woman on his wall - "an assumed girlfriend".