I could do this as £75 for 2 tier or £45 for single tier but would need you to provide the Lego bit for the topper. I can add characters for £7 each or you could provide them. I would put the cake on a larger board and have Happy Birthday etc written on the board.
I love the pink colour on this one and all the detail around the side. £45 for single tier including all the flowers, edging around cake, pool and diving board. If you could provide the characters, or I can make the characters out of sugarpaste for £7 each.