Treat them for tapeworm and then you are covered as advised below.
quote from Defra....Tick and tapeworm treatment is still advised. It is best practice, and best for the health of you and your pet, to treat your pet for ticks and tapeworm before returning to the UK.
The only dogs that need to enter on approved routes are certain assistance dogs, so therefore as long as you have followed all the necessary requirements and have all the documents I can see no reason why you cannot drive your dogs through....
If you need more confirmation you would be better to contact Defra direct.
Website:
www.defra.gov.uk/petsEmail: pettravel@ahvla.gsi.gov.uk
Helpline: +44 (0)870 241 1710