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Kerr comet 145 oil fired boiler

I have the above heating system.  It has an internal heating coil for condumsble hot water. Lately I've been experiencing low to leas than normal flow to hot water taps including the showers. Reasonably normal water flow in mix position and cold but hf or less when turned towards and completely to hot. It'd not an easy task without actual knowledge to remove and replace hot water coil. I can separate the hot line at the temp control but the cold would have to be unsoldered or cut then remove the bolts for the coil. It is the original child which the system was installed 22 years ago. What's the procedure for removing the coil other than the two water connections and the mounting bolts.
Plus do you think my water flow is due to a plugged/calcified coil?