"It has been agreed that the Terms and Conditions of your employment should be varied so as to include an incentive bonus, the details of which are set out below: The bonus is based on achievement of the following IiP…..Targets."
"As a member of the IiP team, under present arrangements, you have a separate bonus scheme in place until31 March 2000 . At that time, new arrangements will be required. These will be such that you are not disadvantaged in comparison with employees on the staff bonus scheme outlined above."
"IiP BONUS ARRANGEMENTS –1 APRIL 2000 –31 MARCH 2001 ."
"The IiP bonus arrangements relating to you for this year are as follows. These are non-pensionable:£2,000 (gross) paid in September 2000, subject to achievement of mid-year target of 32 recognitions.£2,000 (gross) paid in March 2001, subject to achievement of end-year target of 135 recognitions. These bonuses will be paid upon agreement by GOL that the targets have been achieved. To receive the bonuses, you must still be employed by LETEC at the time of payment. You will not be eligible in addition for any payments under the discretionary company bonus scheme during 2000–2001, apart from a pro-rata amount for the period 1 January to31 March 2000 ."
"I must say that I had thought that it is now well settled that it is not legitimate to use as an aid in the construction of the contract anything which the parties said or did after it was made. Otherwise one might have the result that a contract meant one thing the day it was signed, but by reason of subsequent events meant something different in a month or a year later."
"The meaning which a document (or any other utterance) would convey to a reasonable man is not the same thing as the meaning of its words. The meaning of words is a matter of dictionaries and grammars; the meaning of the document is what the parties using those words against the relevant background would reasonably have been understood to mean. The background may not merely enable the reasonable man to choose between the possible meanings of words which are ambiguous but even (as occasionally happens in ordinary life) to conclude that the parties must, for whatever reason, have used the wrong words or syntax…..The 'rule' that words should be given their 'natural and ordinary meaning' reflects the common sense proposition that we do not easily accept that people have made linguistic mistakes, particularly in formal documents. On the other hand, if one would nevertheless conclude from the background that something must have gone wrong with the language, the law does not require judges to attribute to the parties an intention which they plainly could not have had."
"…..you have a separate bonus scheme in place until31 March 2000 . At that time, new arrangements will be required ." (Emphasis supplied)