Having destroyed the Silicone Plug Cap, trying to remove the one on the right, found replacements are no longer available from MG. This one from NGK worked fine / "NGK 8031 Spark Plug Boot Cap LB05E 90 Degree 5K Resistor". It screws onto the plug wire, the separate bottom seal was not a good fit into the tunnel the plug lives in though. Filled the caps interior with Dielectric grease and it should be fine.
BTW the "Ruibapa Spark Plug Removal Pliers 11inch Long Reach Hose Grip Pliers For Car P-027", on Amazon, is handy to have before tackling this job.
BTW the "Ruibapa Spark Plug Removal Pliers 11inch Long Reach Hose Grip Pliers For Car P-027", on Amazon, is handy to have before tackling this job.