This depends on your actual date of redundancy. If, e.g., he has said that your date of redundancy is 28th February, then you are effectively employed until that date and holiday/pay entitlement continues to accrue, even if you have been told not to attend the office or do any work during that time.
Redundancy pay is tax-free, but your actual salary and any holiday pay paid to you will not be. Check your employment contract regarding actual redundancy money. Statutory redundancy pay entitles you to :
1½ week's pay for each complete year of employment when the employee was between the ages of 41 and 64 inclusive
1 week's pay for each complete year of employment when the employee was between the ages of 22 and 40 inclusive
½ week's pay for each complete year of employment when the employee was between the ages of 18 and 21 inclusive.
The maximum an employer has to pay is £270 p.w., unless your contract states otherwise.
Also, if you are intending to get another job as soon as possible, you need to be careful as taking a job before your redundancy period ends can affect your right to redundancy payments. I won't go into detail here, but, if this looks like happening, let me know and I'll post the relevant information.