plan: Use longtable package for multiline table
plan: Minor indentation fix
plan: Update project Gantt chart
plan: Pedantic wording fix
plan: Insert a cross-reference
plan: Re-order figure position
plan: Ellipsise the multi-page table footer
plan: Better wording of implementation milestones
plan: Update flow-tech-choices diagram
plan: Fix £ symbol
plan: Embolden risk table headings
plan: Minor re-wordings and typo fixes
plan: Insert a logical page break
plan: Slightly increase table width
Import Markdown port of project plan

Generated by pandoc, with the first round of hand modifications applied
to spruce up the line widths and fix the indentation.

Issue #215.
plan.md: Add table of contents

Generated by doctoc and tidied by hand.

Issue #215.
plan.md: Add title page contents

Issue #215.
plan.md: Import PNG renders of PDF assets

Issue #215.
plan.md: Use letters for appendices sections

Issue #215.
plan.md: Fix figure, table and appendices refs

Issue #215.