"You can pick from any one of numerous scenarios, e.g.

At the start of WW1 a recruiting sergeant was allocated to each village - he would get men to attest and send them off to the barracks to be documented and kitted out.

Also at the start there were temporary recruiting stations in most major towns to which men could come from their villages. You could also report direct to the barracks.

There were recruiting marches - you could tag along and attest when the parade stopped, usually in a large park.

The local regiment used to set up a station on the county border to waylay men trying to cross to join another county regiment (eg the Royal Berks had such a station on Caversham Bridge in Reading) - men were attested on the spot and sent to their "rightful" barracks.

In Nov-Dec 1916 men were required to register at their town hall and attest to join either immediately or when called up.

There are many more scenarios and what was put on each form was purely a matter of chance."