It all depends on how your pension is calculated. If it is calculated as a fraction of your final years salary then your pension may be lower. If it is based on say your average salary over the last 3 years, then the negative impact may be less.
You need to check the rules of the scheme. If you dont have a scheme booklet, contact the CIF Pension Scheme office and ask them. It really all depends on exactly how the pension formula is worded.