“In the context of the First-tier Tribunal as a whole, a full costs-shifting jurisdiction is an unusual feature. There is, as a consequence, no detailed guidance in the Tax Tribunal Rules as to the exercise of the Tribunal’s discretion in this respect. This particular costs jurisdiction has more in common with that applicable in the courts, and accordingly it is clear to me, and indeed it was common ground that the principles applicable under the Civil Procedure Rules (“CPR”), and the relevant authorities in that respect, are equally applicable to the exercise by this Tribunal of its power to award costs. These are a reflection of the same overriding objective, namely to deal with cases fairly and justly.”