Bookkeeping work for 6 small businesses

I am looking to outsource some bookkeeping work for 6 small businesses. 5 are ltd companies and one sole trader. There are 40 transactions per month for each. They will require to be done using Sage. A VAT return is required for each monthly. Paperwork can be sent by courier so locality is not an issue.

Please provide details of experience, qualifications and membership of professional bodies with your bid. Ensure that you are able to provide references if successful.

I'd prefer a fixed price, but I'm happy to consider an hourly rate.