It looks like those trees going to be very bushy, short trees. The trunk is very short, you could leave it alone, they are just as pretty when they carry a bunch of fruit.

Those pots are very big for a small tree, it is not needed, you better have some fast draining stuff in there.

Thanks Bob, I guess I will just leave them to it and see how they go. I assume at this stage it's probably too late to get them to grow taller?
Many thanks

There is a way but it is drastic. You can keep the strongest branch and cut of the others. If you manage to straighten the remaining branch this one will than become your central leader, make sure you clean any side branches developing. When that branch is about 4feet tall ,you can tip the top to start your side branches and just keep 4. Closest to the top.

patience, patience, patience.

Thanks, appreciate your help. I feel like at this stage I may aswell leave them to it and see how they go, unless you suggest I follow you method from previous comment?

I understand that the process for developing these trees probably hasn't been the best since the get go, but I have only just recently acquired them at this house so just planning the best approach moving forward!