Proofreading text - from US English to UK English Editing & Proofreading

Our company is developing educational software for children with disabilities.
Here is an example of one such software that we developed:
https://www.abc-maestro.com/

We're looking for an experienced translator to proofread our texts written in US English and correct them for the needs of the UK English users.

We will provide the text for proofreading in the following ways:
- lists of words
- lists of simple sentences
- short stories (written for children from 4 to 6 yrs of age)

Our estimate is that we have around 40 pages of materials.

This project requires the following:
- Experience in proofreading texts in UK English
- Being a native UK English speaker
- Living in the UK (needed for understanding subtle cultural differences between USA and UK)

In your proposal, please share a brief summary of your experience.
You will be asked to answer the following questions when submitting a proposal:

Are you a native British English speaker?
Where do you live?