With regard to parts (a), (b) and (c) of the question, the government does not hold information on overall expenditure within these constituencies. However, per capita expenditure for the North East is shown in the table below as sourced from the Public Expenditure Statistical Analysis (PESA) command paper.
Total identifiable expenditure on services in the North East, per head 2010-11 to 2016-17
£ per head
Source 2010-11: PESA 2016
Source 2011-12: PESA 2017
Source 2012-13 to 2016-17: PESA 2018
A link to the latest edition of PESA is provided below:
Table 9.2 will be of interest as it shows total identifiable expenditure on services by country and region, per head between 2012-13 and 2016-17.
Table 9.2 data for earlier years can be found in past editions of PESA. For example data back to 2011-12 is available in the 2017 edition of PESA, whilst data for 2010-11 is available in the 2016 edition. A link to a webpage collecting past and present editions of PESA is provided below: