Dear Tim,
It's great to hear that your parents are planning to buy a new house! It sounds like you have a clear idea of what you want in your new home. A large lounge and a study downstairs would be perfect for both relaxing and getting some work done. Six bedrooms upstairs offer plenty of space, especially if you have guests or a large family.
I agree with you about central heating; it's much more convenient and efficient than an open fireplace. As for the two parking places or garages, it makes sense given that you have two cars. Do you know if the new house has a garden or a backyard? I think having some outdoor space would be a great addition for leisure activities or even gardening.
Also, have you had a chance to look at any specific houses yet? What areas are you considering? It might be helpful to make a list of your top priorities and see which houses meet most of your criteria. I wish you the best of luck in finding the perfect home!
Best regards,
[Your Name]