They could possibly be anticipating that the ECB will raise during this time so if anyone signs up, when they come off it variable and fixed rates will be up.
Just for clarification here, the EBS 5 month rate is of 3.75% is an annualised rate i.e. you are not getting 3.75% for giving them your money for 5 months, you are gettin 5/12 of that rate.
Im confused Munster, for a period of 5 months are you not earning a gross rate of 3.75% for your deposit? and in terms of equating that over a year the rate would be 3.79% (as per best buys table)?