Well I am pleased to say I fixed it myself (well with some Dad help who was a TV engineer). Taking a look myself we found around 6 of the wires were broken from boot operation. One by one we soldered the broken wires back together and added tubing over each repair (when heated with hairdryer it shrinks into place. We thought success but still no central locking. The. We checked the fuse which was blown (probably from all the short circuiting) so replaced it. Low and behold it worked !!!! So we can lock doors and open boot with key. It took some perseverance over 2 hours+ but saved probably £400+ being quoted by the garage. Did not need to buy a new boot mechanism!. Hopefully that should solve the issue for a while but I know it’s an area of weakness so we will see !!!!
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