using a constant field

[Fred]

Hi Planet!

I have created a table (see test script below)

I have an Id field that will contains numerical values.
For reason behond my control This field has to have a
constant hard coded letter V in front of it.

V4789
V0023
ect...

Is there a way know to man kind to do this and
avoid storing 100 000 letter V for nothing...
And maybe keep a INT type rather than it becoming
VARCHAR or CHAR.

thanks for your help.
CREATE DATABASE JK_PROD;
USE JK_PROD;

CREATE TABLE VOUCHERS (
Id INT(8),
Marketing_Code VARCHAR(15),
Date_Created DATETIME,
Date_Used DATETIME,
Account_Nb VARCHAR(10) NOT NULL,

PRIMARY KEY(Id)
);

CREATE UNIQUE INDEX IDX_VOUCHERS ON VOUCHERS (Id);
INSERT INTO VOUCHERS VALUES
('','mrk code 1','2004-01-01','2004-01-02','AC01');
INSERT INTO VOUCHERS VALUES
('','mrk code 2','2004-01-01','2004-01-02','AC02');
INSERT INTO VOUCHERS VALUES
('','mrk code 3','2004-01-01','2004-01-02','AC03');