For those interested I've calculated estimated costs:
Mileage 1442
Avg MPG 20
Cost/litre £1.30
Cost/gallon £5.90
Gallons Req'd 72.1
Fuel cost £425.53
Hotel - UK 60
Hotel - DE 300 Including food/drink
Ferry 80
Total £865.53
These are
estimated costs and may be more/less depending on individual circumstances