I absolutely love this grouping of tulips in their containers!

So do I! This wonderful RHS garden really do excel themselves in Spring with their displays of tulips in pots. Quite inspirational.

So do I. Very striking!

Sue -

Didn't realize this was in the UK. I'd like to do this myself, but not sure how to go about it in our zone 5a climate. Though I was able to get bulbs to bloom in a rather large planter box 4ft x 2ft x 2-1/2ft (I think those were the dimensions without going outside to measure again) that I planted in the fall. I bet they did their chilling outside of the pots first, though, don't you think? Otherwise the pots might freeze and crack.

Alex these fabulous pots are outside all year at Harlow Carr. When I was there last month they were already potted up with next year's tulips. They use them for summer bedding as well. They really are experts, being the Royal Horticultural Society I guess they would be, the plants are done lasagne style I believe with several layers of bulbs.
I can't wait to see next year's display!
The first two photos are from this year and the last from a previous April.

Sue - those pots are beautiful even without the plants, as evidenced by the second photo! I still wonder at their standing up to deep freezes. How cold does it get there? You don't think they wheel them in somewhere during the deep winter?

I'd say the average UK temperature in winter is 25 - 36F. We get occasional freezes and some snow but often have relatively mild winters. (Living in Maine was a total shock for me!)
These pots certainly do stay in situ throughout winter. The bulbs are planted around November and the crocuses usually appear in March as in this photo.

Haven't lived in Maine, but I know they must get as cold as Michigan. If it doesn't get much colder than 25*F where you're at, I can well imagine Maine must have been a shocker!