Well done you have narrowed down the fault on your 25+ year old engine to either the water pump or the PAS pump.

If I were you I would treat the engine to an OEM quality replacement of both items which would do you for another 15 to 20+ years (they don't make them as good as they used too). No need to buy from Landrover, other brands are available but avoid the cheaspest you can find....

On reassembly use new bolts/fittings and smear with 'Alluslip'.

patrickr90 said:

Yes, it's a good time to do it. I had wanted to do cambelt myself but new to this vehicle so don't want to stuff anything up on such a mission critical job. I've also developed a recent phobia of shearing bolts and I gather there's potential for this with changing the water pump. I'm sure I'll get over it!

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My son made a decision to pay a specialist to do his cambelt, worst decision ever! It has been an endless drama since putting right their f××× ups since. The potential to go wrong is there regardless of you doing it or not, ether way it costs you. Bolts should not be a problem if the cambelt has been changed per spec. Ok I found it a bit stressful, not having done it before, learned some things as I went along, made some mistakes most likely but atleast my time is free.
Had to replace the timing chest twice, return a faulty oem belt kit for refund, make the specialist replace the original parts they broke and then write a letter with regards to small claims court for ongoing costs putting it right.
Apart from that it all went well!

With regards to the noise, have the water pump replaced with the cambelt. If the noise is still there you can change the pas pump yourself at a later date if you are happy doing it.