Neighbours of a millionaire who illegally built 'Britain's best man cave' are furious - claiming a massive indoor swimming pool has now been built in the family's garden.New aerial photos above Graham Wildin's home show a new building - which locals say started appearing late last year.Accountant Wildin, 69, has already been ordered to tear down his extensive 'man cave' by a council - but still refuses to do so.Documents show he has transferred the ownership of two adjacent properties to a company run by his kids.And now in the back garden of one of them a large building has appeared - which locals say is an indoor pool.There appears to be inflatable toys piled on the decking outside.Drone images show the new building stands alongside the controversial illegal complex that includes a cinema, squash court and bowling alley.It is unclear whether he needed planning permission for the latest expansion as some pools are deemed 'permitted developments' depending on the scale.However, no applications appear to have been submitted by Forest Dean Council in relation to it.A council spokesperson said they couldn't comment due to the ongoing legal proceedings. Neighbours said it feels like Mr Wildin has now "doubled down" on them over their objections to his refusal to follow the rules.One neighbour who lives on the road said on Monday (11/04): "He's not very well liked.''He's upset everybody on this road by flouting planning rules and then parking his collection of classic cars everywhere."He's had a swimming pool built at the back, finished not long ago. That was ongoing for about four or five months."He gets up everybody's back, and to him it's payback time for all the people on this road. ''He's even had his gates repaired to keep everyone away from his house."There's always something going on up there, they started on the swimming pool which went in late last year."We don't see him very often. It's just a shame because he used to be part of the community and would join us in street parties and stuff, but now he's just annoyed everyone on the road and treats us badly."I don't know how they're going to knock down the buildings now though he's give away his houses, but hopefully they will find a way."