I don’t like this thread at all. So obvious that the seller wasn’t intending to include the allotment in the sale - just hadn’t bothered to alter the title deeds not to include it . Maybe she didn’t even realise the allotment was linked to the title deeds.
I think you’re making a big mistake. Fine, you’ll have an allotment, but if your neighbours all hate you and don’t bother getting to know you, then how much pleasure would you get from sitting in it?
if the owner meant to sell it, it would have been in the listing.