The consultant will go through any medical condition that may affect the existing cover you have should you move to another provider. They will never put your health at risk.
Any pre existing conditions will be sent to underwriting to see if it's possible to cover them with another provider. If it's not possible you will be informed of the exclusion, and then the decision would be for you personally to make.
Hospital lists vary depending on where you live in the UK. The consultant will always try to put you on the most comprehensive hospital list available although the cost will vary depending on the choice you make.
The excess you select will affect the cost of your policy, we will always endeavor to keep the excess as low as possible.
Your no claims bonus can be protected in most cases, although you would need to speak to the consultant to confirm this.