I would like to purchase a mains operated electric shaver

Many Remington shavers sold in the US are only for use with 120V. Voltage in your country may be 220V-240V. If you attempted to use a 120V charger in your 220V electrical outlet without a voltage converter, you have probably damaged the charger.
Chargers can be purchased at shaveroutlet.com. You will need your shavers model number to select the correct cord. And, you may need to use a voltage converter if the replacement you get is for use with 120V
ShaverOutlet com ShaverOutlet com Cords Chargers Stands Shaver Replacement...

If you're in the US, go to Product Registration

If you're not in the US, go to Select your location and language then select your country or region of the world and go from there.

I find going in circles and diagonals against the grain is best.

Europe uses 3.

You can purchase them from shaveroutlet.com and have them delivered to your mailbox. See link below

http://shaveroutlet.com/shaver-replacement-parts/norelco-philips-hq8-spectra-sensotec-replacement-heads-p-251.html

Panasonic does not sell the specialized batteries for their shavers. Your best bet would be to purchase one of the models that replaced it. I have included links to two models below. These are very similar to model ES4011 and use the same shaver head as your model

http://shaveroutlet.com/shavers/panasonic-es-rw30s-mens-wet-and-dry-shaver.html

http://shaveroutlet.com/shavers/panasonic-es4026-shaver-with-er416-nose-and-ear-hair-trimmer-p-699.html

the only shaver currently being marketed as 'bump free' is made by Wahl. It can be purchased at shaveroutlet.com. see link below

http://shaveroutlet.com/wahl-bump-free-cordcordless-shaver-p-579.html

shaver batteries can be purchased at shaveroutlet.com

philips norelco 4222-039-10972 adapter charging cord for electric shaver norelco 7775x power cord replacement parts.