Hmmm, how about grandparents/aunts/uncles?
I would go for trike personally as no matter what the weather little boys will always have fun on a trike being pushed around...maybe ask relatives for activity table and then keep eye on ebay/netmums for sand/water table.
For what it is worth we use ours more with water and washing up liquid so there are loads of bubbles for Mogster to play with. Moglet is gonna end up with all stuff Mogster has had first but we are hanging on to it ready for him to grow into!
Found another similar trike but without the safety bar, instead it has a harness, depends how stable Jac would be...https://direct.tesco.com/q/R.206-9830.aspx opens up the possibility of triek and table tho...?