How long has the conservatory been there? - if greater than 4 years, no Planning Dept can demand its removal anyway - and one can apply for a Certificate of Lawful Usage which 'regularises' it being there in the first place without PP.
Needing Planning Permission for a new roof is news to me - unless the shape of the roof was changed in some way (dormers inserted, say) or unless this house is in a Conservation Area or a National park or an AONB.
Are you sure this issue isn't about lack of Building Regs Approval for the structures? - which is a different thing from PP. This is the more typical situation in which indemnity insurance policies may be used. And if it is, many conservatories do not require Building Regs approval in the first place (because they are regarded as non-habitable structures).