Vouchers can be sent electronically and the legislation is there to back it up. HMRC also make this pretty clear on their website.
As mentioned earlier on the thread:
If you have agreed to get your dividends paid electronically you may get your dividend voucher in paper or electronic form.
In 2003 further provisions to ICTA88/S234A were introduced under SI2003/3143 to allow statutory dividend vouchers and tax deduction certificates to be sent by electronic means. The regulations do not prescribe the methods of electronic communication that must be used, but possibilities include sending PDF files by e-mail or making the voucher or certificate available on a secure website for the recipient to download.
The actual legislation:
The Income and Corporation Taxes (Electronic Certificates of Deduction of Tax and Tax Credit) Regulations 2003
The only thing that isn't entirely clear is whether or not the electronic copies still need to be signed (digitally or otherwise), so maybe best to sign them electronically (using either a scanned signature or some kind of e-signature service) to be safe.
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