Can you spec me a sight ??

[Mozzie]

I've had a Simmons for about 10 years now and it's been great EXCEPT the slightest knock and it needs zeroing, which means I nearly always miss with my first shot.
I just shoot vermin in the garden (max 40 mtrs) , mainly maggies and greys with my Webley raider (non FAC).

I'd quite like a red dot for fast aquisition or possibly a green dot laser ( the red dot laser I have is useless in daylight). Has anybody got any recommendations so I can pass it on to the Mrs , who will then without compaint, put it on her Barclaycard for my satisfaction on Christmas Day Many thanks.