Migration of 15 Websites to UK Host

I need to move 15 websites to a new hosting provider in the UK. The websites are primarily E-commerce and Corporate.

Key Details:
- Type of Sites: The majority of the sites are E-commerce and Corporate.
- Migration: The migration needs to be seamless with no website changes.
- Hosting Requirements: The new hosting provider must be optimised for speed.
- I have Cpanel access
- I am open to use an existing provider that can be recommended by the person I hire.

Ideal Skills and Experience:
- Proven experience in website migration, particularly for E-commerce and Corporate sites.
- Familiarity with UK hosting providers.
- Knowledge of speed-optimised hosting solutions.