Desperately seeking little red plastic window lock keys

[piemanpete]

Hi Folks.

Just moved into a house where all the wooden windows are fitted with an unidentifiable plastic window lock. There are many windows but only one key for the whole house and I cannot find any more keys anywhere.

The lock bolt is round and the key engages in it to lock/unlock it with a quarter turn after pushing the bolt in or pulling it out.

If anyone can help ID the keys and advise where I could get some more I'd be very grateful. I will be happy to email you some pics.

Thanks.

[/img]