Just updating for everyone's benefit. I received this reply from UK:
"
Dear Sir
I have attached a link to our website with our form you will need to fill in. Please complete the fast track form and state in covering letter you would like your entry and exit records. Please note that entry and exit records only go back 5 years.
https://www.gov.uk/government/publications/requests-for-personal-data-uk-visas-and-immigration
Please supply a copy of your passports photo page with your application. We do not require a £10 fee or certified ID for entry and exit requests.
Regards
SARU"
So I will be following this process. Will reconfirm and update once I receive the records.