Thanks all for your replies, think I am going to have to go with the poison. I have already borrowed my sisters jack russel, she goes mad but cant get at it because it is burrowed into my old stone wall. I have had all obvious holes cemented up but it just comes over the wall now. I will try wetting the wall daily but someone told me they did not like bleach and I used a syringe to squirt bleach into all crevices and down side of wall and at base but within an hour it came over the top of the wall. This is one tough rat!
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.