Manston Radio Frequencies

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Hi all,

I am currently training for my PPL and am trying to plan a flight into Manston. After looking in the UK AIP I have found 3 different Approach Frequencies, and I was wondering when flying into Manston, which would be the first frequency you call on as you were inbound:

126.350
119.925 or
129.450??

Also, in general if you were flying to an airfield wiith more than one approach frequency, how would you know which one to use??

Thanks in advance for your help,

101