calculate_vcs           Extracts varying coefficient estimates (for
                        SVC, TVC and STVC models).
evaluate_models         Evaluates multiple models with each predictor
                        variable specified in different ways in order
                        to determining model form
gam_model_rank          Ranks models by GCV, giving the model form for
                        each predictor variable.
hp_data                 London House Price dataset (Terraced,
                        2018-2024)
lb                      London borough boundaries
