My feeling is that, although you probably support the general principle of allotment provision, you do have a personal interest in the outcome of any decisions to do with allotments. The extent of the interest is questionable, since it is unclear whether you would gain financially. But it is best to err on the side of caution. You should therefore declare an interest. It is helpful to obtain advice from the clerk, but in the end, the choice of whether to declare an interest is the responsibility of the individual councillor and neither other councillors nor the clerk have any jurisdiction in the matter.