Loft Ventilation

I am about to have the loft in my early 70's Wimpy semi insulated. What is the best means of avoiding condensation? The deisign of the roof does not seem to allow enough room for soffit vents to be fitted to alllow air flow. Would the installation of vent tiles on the roof be a solution? Thanks

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.