	2020			2019			2018
	(in thousands)
	£			£			£
Own share reserve		(339	)		(339	)		(339	)
Foreign currency translation reserve		(22	)		(10	)		1
Capital reserve		42,466			42,466			42,466
Share option reserve
Balance at beginning of year		20,620			17,564			15,955
Share-based payments		4,823			3,289			1,977
Exercise of share options		(68	)		(132	)		(186	)
Forfeiture of share options		(518	)		(63	)		(182	)
Lapse of share options		(75	)		(38	)		—
Balance at end of year		24,782			20,620			17,564
Total other reserves		66,887			62,737			59,692

The foreign currency translation reserve is used to record exchange differences arising from the translation of the financial statements of foreign operations.

The own share reserve represents the cost of 500,000 shares of NuCana plc purchased by NuCana Employee Benefit Trust and that may, at the discretion of the trustee, be used to satisfy future exercise of options under the Company’s share options plan.

The capital reserve balance arose from the reduction of the share premium account and corresponding increase to the capital reserve account reflected as of June 30, 2017 in connection with the Company’s re-registration as a public limited company.

The share option reserve is used to recognize the value of equity-settled share-based payments provided to employees, directors and consultants as part of their remuneration. Refer to Note 13 for further details of these plans.