Hi Kevin, the Lozenge Sofa is a John Lewis product I'm afraid. Two man deliveries are problematic to Northern Ireland since the costs are prohibitive. It sounds like you have been somewhat inconvenienced and I am sorry to hear this but if John Lewis are unable to find a courier there is not a way around this.
There are third-party services that will arrange collection and forwarding but they tend to be quite expensive.
Sorry I wasn't able to help and hope you are able to find a suitable alternative.