Add a few metres to your house for a new kitchen/diner that leads nicely into the garden.
Kitchen diner extension
Lovely kitchen colours
Extensions Beginners Guide: Part Two | Homebuilding & Renovating
Something like this for the lounge in the open plan living area, with big doors that open to the garden area
small kitchen diner extension - Google Search
Stunning open plan kitchen and living area in London by Zona Cucina.
KITCHEN EXTENSION PLANS 3