Turn off hot feed via gatevalve (cylinder cupboard), disconnect pipe from top part of isolation valve, leaving isolation valve closed at this point.
Connect a suitable piece of pipe, or flexi hose to top of isolation valve. Re-open gatevalve, get a bucket and angle flexi or whatever into bucket, open isolation to start flushing pipe/water out.
Check if obstruction comes out, if this has, reconnect everything, if not then carry on.
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