This will probably end in a reapplication. Technically the original planning permission is now void as the conditions were not met - and now can't be met! That may be more your neighbours problem than yours but since your property was granted the original planning you can't avoid getting caught up in it. I wonder why this has come up now after 2 years. Are you now parking on road and ****ing somebody off? If you have adequate off road parking you could reapply with a new scheme and that should sort everything. Your neighbour might go halves with you on the app since it is their house that now doesn't have planning permission.