When I used FreeAgent there was a report which produced a simple dividend voucher, it was really useful.  It was just one page of A4.  It read:

Dividend Declaration for [Company Name]

Directors Meeting Held On:

Directors Present:

Held At:

At a meeting of the Directors of the Company held on the above date, it was proposed and resolved to confirm the payments to the shareholders of the Company Dividends in the proportion of their respective shareholdings in the amounts shown below.

The total distribution details are:

Net Dividend: £XXX

Tax Credit: £XXX

Gross Dividend: £XXX

The shareholders were advised of these amounts and cheques paid/drawn accordingly.

There being no further business, the meeting was adjourned.

_____________________ Director

_____________________ Date

Payment Details

Payee  XXX

Value  XXX

Date XXX

Total: £XXX