Thanks all, local garage put me in touch with Northampton Cylinder Heads, 3 hours later it was all fixed. No matches needed and another Freelander lives on...... sorry!

Afternoon all, I could do with some help. The thread on number 1 spsrk plug has stripped on my Freelander. Yes, it probably was me but no one can prove it! My question is can this be helicoiled in situ and if so does anyone know who could do this in the Midlands? I live near Market Harborough...