1814 EL from London with HENLEY-T / 38 and BELFAST / 80

1814 Entire Letter from London to Dublin with fine HENLEY-T / 38 mileage (Whitney Type 74) in black, re-directed to Ballycastle wia Belfast with very fine small 32 x 9mm BELFAST / 80 mileage in red, reverse with clear brown "Mermaid" without code but lacking detail.