House prices will collapse this year in the UK. As the year goes on your value will decrease and there'll be less and less buyers. Even finding a buyer will be a struggle and no chance of a 3 month completion.
Cars cost the same in Thailand as UK from new but depreciate less. 99% are on long term finance so hold their value far longer. If you are only doing occasional trips then it's far cheaper to rent taxis or drivers as needed.