Looks like I have a ratty problem in the wood shed. I need to buy some suitable bait but there is a wide selection available any suggestions to which is the best/most cost effective? Mole Valley and Countrywide stores do their own but have also heard good reports on Tomcat. I could use blocks or if treated grain which I will place in plastic cash bank bags which in previous years have been very effective. Would think 3kg max needed.