is the Sail Rail (which as I understand it is a SOR) valid to be used with the supplement?
But the ticket valid via Crewe is not a SOR, For example, Kyle of Lochalsh - Dublin Connolly CIE tickets are:
route Stranraer Stena
SDS £57
SOR £114
route Holyhead Stena CIV
ECS £31.50 6C
ECR £63.00 6C
Restriction 6C is:
National Fares Manual NFM 07 CD said:
Outward & Return Travel
Valid on date on ticket only.
Valid on Stena Line services port to port only.
Reservations are compulsory on the ship leg.
Break of journey on rail leg only.
No unaccompanied children under 16 permitted to travel.
Refunds
Tickets issued in the UK: Standard refund procedures apply.
For tickets issued in Republic of Ireland: Refunds cannot be given. The customer must claim through Irish Rail.
ECS/ECR is Economy Single/Return. This means the ticket does not carry the priviliges of a SOR, for example free upgrade to First Class at weekends on Virgin Trains. The full description is:
National Fares Manual NFM 07 CD said:
Ticket Code: ECS
Ticket Class: STANDARD
Ticket Name: ECONOMY SINGLE
Single/Return: SINGLE
Out Validity:- DATE ON TICKET ONLY
Break of Journey: NO
Ticket Code: ECR
Ticket Class: STANDARD
Ticket Name: ECONOMY RETURN
Single/Return: RETURN
Out and Return Validity:- DATE ON TICKET ONLY
Break of Journey: NO
Reservation coupons for the ship leg are mandatory and rail tickets are not valid without them
NOT VALID PORT TO PORT
Planning to break en route at Bangor
It seems that break of journey (except on the ship!) is specifically permitted by the Restriction code and specifically prohibited by the description of the ticket type. Note also that both outward and return legs are valid only on the date shown on the respective tickets (with, presumably, the usual rules about continuing into the second day where necessary).
There is no restriction in either on the use of sleepers, so I agree the tickets should be valid on payment of the appropriate supplement.