I have been asked to reply.
The information requested is as follows.
(a) Fuel smuggled from Northern Ireland into the Republic of Ireland is a matter dealt with by the Republic of Ireland authorities. HMRC have no record of seizures made in the Republic of Ireland.
(b) It is not a smuggling offence to transport fuel from Northern Ireland to mainland Great Britain, as this is an internal movement within the United Kingdom. Therefore, no such seizures have been made.