A brand new Swift Elegance with a delaminated floor is clearly unfit for purpose.
Go back to your dealer and demand a full refund under the Sale of Goods Act 1979 ( and as amended ).
A failed floor front to back is serious enough to demand a complete refund or replacement rather than a repair. Check your caravan insurance policy. You may have some Legal Expenses cover which may help you.
Don't take no for an answer.