my jack russell keeps weeing in the kitchen

by Sarah
(Stafford)

rescued jack from a dogs home about a year ago, believe he is 3yrs old now.
normal routine; walk in the morning, we go out to work so he has run of the house(down-stairs), I come home at lunch time-let him out when go back to work he has the lounge again. then walk again in the evening.

last week, came home at lunch-time and he had weed on the rug in the lounge, so that afternoon i put him in the kitchen (tiled floor!)
next day, can back at lunch and he weed on the carpet in the lounge again.

we're keeping him in the kitchen from now on-only when we're at work. leave the radio on for him, he has food toys water and bed. every time we go out we come back to wee everywhere.
any advice/help would be very appreciated!