I have a rover75classic 54 it is leaking water when it rains on near side is it a useual fault

If it has A/C the drain hose could be blocked and if no A/C it could be a leaking windscreen seal.

A water leak under the dash could be the heater leaking near the glove box, or a windshield leak, or sometimes the drain tube for that area has gotten plugged up and needs to be cleared out. Most times a little blast of air pressure will do it.
Hope this helps.

Leaking trunk seal or rear window sealer also check the tail lights are mounted properly and that the trunk is closed all the way

Hole in firewall rain leakin down and in. At least thats my prob. Some silicone should work

No it is not a common problem. You will need a leak test done using a rain maker fixture to see where the water is coming in.

My Getz is also having similar problem. I have thrice got water test done from Hyundai server center. After 2nd test they put some sealants underbody and return the car, but still water was leaking in. 3rd time water test, hyundai said its all fine, no problem but still problem persists. It happens when it rains only, so I dont suspect air-con filters or radiator problems. Water pool is created in driver side footwell only. During heavy rain, I tried to troubleshoot but couldnt find any fault point from where water might be leaking inside. Its second year, I have running into this problem, creating stinking smell inside the car due to wet mats. Looks like I need to do away with my car.

All what suggestions?

When diagnosing a water leak, here's a handy tip. Check the accumulated water. If the water is dirty, look for leaks from the underside of the vehicle (floor, wheelwells, etc). If the accumulated water is clean, look for leaks from the topside of the vehicle (trunk seal, window seal, etc). To find where the water is coming from, shut yourself in the trunk with a flashlight and have an assistant run water over the trunk with a garden hose. You may have to remove some of the interior trunk trim to see exactly were the water is coming from, but chances are you'll find it. Also another common cause of water leaks are from impact damage, so check for collision damage repair. while your in there. -hope this helps.

let's try something here and see if works,
get a garden water hose and put the most pressure near where you see leaking water and have someone inside the car look for it.

G

Windshield seal may be leaking. Find leak repair with clear silicon caulk may work.