Replacement roof ventilation (cold)

[osprey]

I am not doing this myself, but have found its better to fully understand as though I were, before letting a tradesman loose..

 

I am planning to replace the original roof of my 1920s detached house. Currently clay tiles, close borded beneath and bitumen paper beneath that. Rooo flares at the edge. No vents apart from open cavities. Soffits are LARGE (750mm?)and have been covered with plastic. All hips, no gables.

 

I would like to get good ventilation in the loft, as I am filling the cavities. I would also like to minimise cold bridges at the wall plates. 

 

What should I ask the roofer to do, when getting quotes?

 

Current proposals only mention tile vents (along with Dry ridge etc). Should there be strip eave vents, etc? Soffit vents are not an option.

 

Any advice welcomed!