I'd electrify the Midland Mainline north of Bedford to Nottingham and Sheffield. Then i'd also electrify the line from Sheffield to Doncaster and from Sheffield to where the line joins the Leeds mainline. Then when the HST's need replacing you can order new higher speed electric trains and rid the Meridians to Cross Country as they need more capacity. You could then also extend the Thameslink network north to locations such as Corby or Leicester.
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