"No action shall be brought to recover
(a) any principal sum of money secured by a mortgage or other charge on property (whether real or personal); or
(b) proceeds of the sale of land;
after the expiration of twelve years from the date on which the right to receive the money accrued."
"no arrears of interest in respect of any judgment debt shall be recovered after the expiration of six years from the date on which the interest became due."