Thanks for getting in touch! I apologise for any inconvenience caused.
I have tested things from here and I can see that there's some time outs inside the Hubs logs, an engineer will be required to attend in order to proceed with making the booking.
I will send you a PM (purple envelope at the top) detailing what's required to proceed with making the booking. Please respond to me there and I'll get this all sorted for you.
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I have sent you a PM outlining further instructions.