There are a few problems with the Type 45... At present the SAM system doesn`t work they still havn't fired a missile from a Type 45 and the last 2 test launches from the test barge both failed!!! For the same cost the RN could have purchased AEGIS or even the latest Block Arleigh Burkes which would have been cheaper carry more SAM's and have already got the integration for Tomahawk's etc... As she sits she would need to have the ASTER system VLS replaced to carry Tomahawk... They have finally relented and are giving the ships a pair of Phalanx guns as she was originally designed without them... Also they carry no ASW Torpedo Tubes!!!
Apart from that when they get all their kit working and on board they will be a good boat but for the same money an Arleigh Burke Flight 2 would have been a better buy... So for the final cost of the 6 Type 45 DDG, each carrying a total of 48 SAM'S, the RN could have had 12 Arleigh Burke's each carrying 96 SAM's.
I know and this from an Englishman terrible...