Jeds reply is good, but planning guidance is just that, guidance, not a legal requirement. It will simply be a case of you objecting to the planning application and referring to any guidance that the local authority has. Note that bungalows are usually allowed to have much smaller gardens than 2 storey houses as there is unlikely to be any overlooking from the new property if there is a fence along the boundary.
Note that 'rights of light' are totally separate from planning issues - they are a separate legal issue that you can potentially claim under when the property is built - though if it is a bungalow, it is unlikely to have much affect on your light levels.
It is also worth checking party wall rules - you may need to have a party wall agreement with your neighbour.
Note that 'rights of light' are totally separate from planning issues - they are a separate legal issue that you can potentially claim under when the property is built - though if it is a bungalow, it is unlikely to have much affect on your light levels.
It is also worth checking party wall rules - you may need to have a party wall agreement with your neighbour.