Letter of Engagement for Bookkeeping

Good afternoon All

I have taken on a client where I will only be preparing the bookkkeeping. This will then be passed on to the existing accountant who will draw up the tax return and submit.

I cannot find a sample L of E on the AAT Licenced Accountants website for this. Do I not need a L of E if I am only carrying out bookkeeping?

Many thanks

Liz