After our Ireland trip, Steve and I flew from Shannon to London and hired a car through OTS (Onward Travel Solutions) to take us from Heathrow to Southampton cruise port where we boarded the Norwegian Jade for a 10 night tour of the British Isles with stops in Guernsey Island, Portland (Jurassic Coast), Cork, Irleand; Belfast, Northern Ireland; Kirkwall, Orkney Islands; Invergorden (Inverness), Scotland; Edinburgh, Scotland, and returning to Southampton. We booked our return from Southampton to Gatwick with the same car service. I decided on the airport taxi car service because the times were tight both ways and the cost ended up not being not much more than the train and taxi fare for the two of us. (The NCL transfer for two would have been $150 and the private car was a little over $100 from Heathrow to boat and $125 from boat to Gatwick).
The cruise was lovely. We like only having to unpack once and dining in style.