how do you catch pigeons

To the answer from Cornwall: my work email address is scolclough@calendarclub.co.uk Any help greatly appreciated!!!

Tiverton in Devon

Help someone please? We've had a pigeon with a ring on each leg at our house for 3 weeks now, it comes for feeding twice a day. How do we catch it to get the ring numbers? An answer of don't feed it won't work, my 90 year old grandmother is too upset over it not to feed it - and I need to get rid of it! Thanks.