IT support - HELP!

Could YOU help run our I T systems and Website ?  Full training given.
Tony, our IT Guru who has been with us for 10 years, is leaving in September and we are looking for someone (or two) to be trained to carry out his duties.
1. Website.   The website you are reading plays an important part in promoting our events and taking orders on-line (Some 50% of our box office orders now come via this facility).  The site is created and maintained using open source shopping trolley software called Zen Cart. (   It is fairly straightforward to use and can be updated from home by someone who is IT literate with a bit of artistic ability and half an hour or so a week to spare. Twice a year we publish our new event programme and that takes probably 20-25 hours worth of work to assemble.
The underlying programming of the zen cart software is PHP and CSS with SQL database.  This controls the underlying 'look and feel' of the website so is obviously more complex.  Although we rarely change the design parameters, anyone with knowledge in that direction would be welcomed with much enthusiasm.
2. The Box Office system.  Serving up to five concurrent users, this has been developed 'in house' using Microsoft Access software. It links to the Zen Cart SQL databases to seamlessly transfer web orders into the box office. The system controls all aspects of hall administration, event programming and box office finance. As such it is a mission critical system which has been running for some 10 years with a major upgrade in August of 2017. To support this we need somone who has previously developed database systems using Access VBA. rather than someone who has 'just' used Access for data entry.  Much of the support is carried out remotely so can be done from home. 
As with all our work here, it would be on a voluntary basis only (programming houses need not apply unless they're feeling particularly charitable) but hours worked go towards free tickets for events.  
If you feel you could help please phone Tony on 07810 786638 for a chat or email  
Thank you.
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John Wratton