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Discuss Unvented cylinder size in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Think of your current height and coil height bet that’s over 2m
 
Easier just to seal as @ShaunCorbs says. No point going to the effort to raise the tank.

£360 is up North, so £450 South West is probably not bad 😂

Don't forget, pay cheap pay twice. Good labour costs.
 
Cws tank to current vented cylinder....yes.
Why does the feed and expansion for the boiler need to be a mimimum 2m??

To have a high resistance so when hot water only is on it doesn’t pump over
 
To have a high resistance so when hot water only is on it doesn’t pump over
You are assuming the feed and vent are connected either side of the boiler? I'd have the feed and vent both on the suction side of the pump on a low head system, no pumping over and only consideration is enough head to prevent cavitation.
 
Like this. Both cold feed and vent on the flow pipe off the boiler.
 

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