If anybody in NI would like to contact Tesco & get everyone they know to also, please do so. It may do nothing, but it's worth a go. Here's the reply I got:
Thank you for the email.
I’m sorry to hear of the issue experience due to the petrol station in the Belfast area no longer hold the Tesco Momentum 99 Ron fuel. We are always looking for ways to improve our
service for our customers.
From this, I have passed along your suggestion to our support team for this to be looked into, however, the more requests we have the more likely we can get this put in place in a select few petrol stations within Belfast.
We are always happy to hear our customers' views, so thank you for taking the time to tell us. If there is anything further I can assist with please responded to this email or speak with one of my colleagues via 0800 50 55 55.
Kind regards
Scott Parry
Tesco Customer
Service
Tesco Customer Engagement Centre