5. Non-recurring Items

For the period	52 weeks to 31 March 2017 £m	52 weeks to 1 April 2016 £m
Non-recurring operating expenses:
Acquisition and investment related fees (a)	1.7	—
Organisational Restructure Costs (b)	0.6	1.7
Operating lease obligation (c)	0.3	—
Costs in relation to a historic legal case (d)	0.8	—
Non-recurring operating expenditure	3.4	1.7
Acquisition related interest charge (e)	0.6	—
Non-recurring items before tax	4.0	1.7
Tax on non-recurring items (f)	(0.9)	(0.3)
Non-recurring items after tax	3.1	1.4

Acquisition costs relate to the costs associated with purchase of the share capital of Tredz Limited and Wheelies Direct Limited during the period, and the investment in Tyres on the Drive.
Organisational restructuring was undertaken across Autocentres and Retail during the current and prior years, to better align resource to the requirements of the business. This resulted in a non-recurring redundancy expense of £0.6m (2016: £1.7m). These restructure costs relate to changes in operating structures which are not expected to be repeated.
The operating lease obligation relates to rectification work to one of the Group's retail stores, which was required to make good an area of land upon which the store is located. The rectification work required was unique to the specific site and similar expense is not expected in the future.
During the year the Group settled a court case which related to activities during FY12. The size and historic nature of the settlement was outside the normal experience of the Group.
The acquisition related interest charge reflects the unwinding of the discounting applied to the contingent consideration due on the acquisition of Tredz Limited.
The tax credit of £0.9m represents a tax rate of 20% applied to non-recurring items. The prior period represents a tax credit at 20% applied to non-recurring items.