Mike

LONDON

Engineer

There are two types of fraud which are reduced by requiring attendance at a polling station (Although it would be better if some form of identification were required):
Impersonation of a voter and
Intimidation.

Electronic voting at the polling station could eliminate spoilt papers, make it harder for voting papers to appear from nowhere, and facilitate "fairer" voting systems like the single transferable vote. It might also speed up counts and reduce the cost.
It would still be necessary for voters to present themselves to the polling officer, who would give them a (bar coded?) token to enter into the machine. Tokens issued and votes counted would need to be reconciled.