I dont think it is necessary to have 6 months validity while you hold a valid Residence Permit. 6 months validity of a PP is required if you are travelling to a country without having a valid visa for that country and you will not get a visa if you does not have 6 months valid Passport as well.
In this case I would suggest you to renew your Passport before you go on leave as you do not have too many days left. You are planning to come back at the end of April and in case if you are not able to travel your Passport will get expired and you will be in trouble. So play safe.
I dont think it is necessary to have 6 months validity while you hold a valid Residence Permit. 6 months validity of a PP is required if you are travelling to a country without having a valid visa for that country and you will not get a visa if you does not have 6 months valid Passport as well.
In this case I would suggest you to renew your Passport before you go on leave as you do not have too many days left. You are planning to come back at the end of April and in case if you are not able to travel your Passport will get expired and you will be in trouble. So play safe.