I need a new letterhead

Information for the business: computer solutions for the defence industry
Design details: I would like a new letterhead design and layout for use in a word document so I can use this when I am typing a letter or sending a proposal. It is to be A4 portrait. I want to keep the same logo and keep this on the top left hand side. The strapline needs to read ‘Defence Certified Computers, Displays and Equipment’.
The company address and phone number details are at the bottom of the page on the attached existing letterhead but I want to add also the international phone number as well: Tel. + 44 20 7419 5070

I also want to try and include the logos of the following. These can be seen on the attached quotation form but they can be laid out in a line or in a block, in any order. These are:
- ISO 9001
- Investors in People
- Maritime Society member.
- ADS member
These logos are available on line or I can send them to you.
I am aware this may be a lot of information to get in on a letterhead and it may appear crowded so there may be a few edits to get it right.
Number of pages needed: 1
Content on the front/back side and body: as per design details above
Ideas for the visual style: as per design details above
Extra notes: