The result of the lobbying is that there will be no change. The 22 May GOV.UK update was that travel to 'private or ticketed attractions' ( a new definition) was banned. Then, within 24 hours, the 23 May update permitted travel to 'land open for the public benefit, where numbers may be controlled by membership or ticketing' (another new definition), appearing clearly to contradict the previous days update.
We now have confirmation that zoos are NOT 'land open for the public benefit, where numbers may be controlled by membership or ticketing', but remain firmly in the same category as wholly indoor leisure and direct-contact hospitality such as hotels, with a presumed opening date of July 4th.
This leaves us with an expected date for zoos to re-open of 4th July, and just 8 weeks of potential income before the schools go back and we enter the next off-season. Last winter it started to rain on 21st September and did not stop until two days before Boris' speech on 23 March. This means that there is very little time to recoup income this year, and we will probably not be able to give the 'members and season ticket holders week', prior to full opening we had planned.
Plans are well advanced here (and will be everywhere else I guess), with the physical and administrative issues involved, and our on-line ticketing system has been tested today. If there are enough people made redundant after their furlough and students looking for just 8 weeks of work, we may be able to offer some form of basic take-out catering; but we hope to be able to detail the plans a little more after the weekend.