If you operate within the public and charity sector this is the most memorable and customer friendly number you could choose.
0300 numbers are an alternative to 0303 and are identical in every way, except for the prefix.
The public and charity sector have exclusive use of these numbers.
Recently released by Ofcom 0300 numbers cost your callers no more to call than any normal landline number (e.g. 01/02), even from a mobile phone. Therefore the public trust them and they will be confident when calling you.
With your Inclusive Package you get 1000 inbound minutes. You then pay 1p per minute if you go over your 1000 minutes. Alternatively you may also upgrade to Package 2, 3, 4 for more minutes.