Develop a detailed group booking proposal template specifically tailored for corporate clients hosting events. The proposal should highlight key services offered, including meeting room facilities, catering options, and special offers for groups of [Number of Attendees]. Incorporate a section on potential cost savings with volume discounts, and a timeline for booking confirmation. Ensure the proposal format accommodates customisation, such as adding branded content or additional services like [Additional Services]. Include a pricing breakdown per person based on the group size, along with terms and conditions specific to corporate bookings.