Company details not on emailed sales invoice

[Charlotte Bygate <..hidden..>]

Hi,

We have entered our company name, contact info etc. in 'system' + 
'defaults'.
We have generated sales invoices.
The company details appear at the top of invoices when we use 'print to 
screen'
When emailed to customer, the company details do not show on invoices.

How can we rectify this and also to add our VAT number to invoices?

Thank you for your help.

Charlotte Bygate