Thanks Tim
I had already removed both a batteries by the time I saw this message. I have taken note though as this is worth remembering.
Whilst I have the batteries out I am going to tidy up the battery box a little as it hasn't had any attentions in 23 years and there is some rust that needs to be sorted. So may be a few days before I have it all back together as time is limited during the week.
Thanks again Tim
Cheers - Simon

