From 1 April 2015, practices are required under the contract to allocate a named, accountable GP to all patients (including children).
Unless you have specified an alternative GP your named accountable GP will be the doctor you are registered under. This will in no way effect your care from the Practice and you will be seen by all GPs who have equal access to your medical records. Unless you pre-book your appointment in advance you will be allocated a GP subject to availability on that day.