What if there are no litter signs and bins

I don't see why I should I pay if there are no signs about littering in the area where I dropped it?

The local authority is not required to place signs in every street, road, highway or open park/space to tell people not to litter or to inform them that litter patrols are operating in the area.  Litter legislation has been in force for many years and littering in many parts of the UK is at such levels that local authorities right across the country are now issuing fixed penalty notices in order to drive the message home to those who spoil our towns and cities by carelessly discarding their rubbish.

Why should I pay a Fixed Penalty Notice when there were no litterbins nearby at the time? 

As with signage it is just not feasible for the Local Authority to place litter bins in every street, road and highway in the city, though of course every effort is made to place bins where there is the greatest levels of pedestrian footfall, such as in town centres and major shopping areas.  Where bins are not available it is up to everyone to act responsibly and make arrangements to either take their litter home or carry it until a litter bin is available.