Welcome to the Orchid Board!
There are so many hybrids, there is not specific information about all of them. You can probably find a lot of information on the species Laelia purpurata. All the different clones have the same growing requirements, and are wonderful plants.
Epilaelia is an artificial genus created by crossing plants in the naturally occurring genera Epidendrum and Laelia.
Is the Eliast part written inside single quotation marks 'like this'? This is the normal way specific clones are named. Is your tag broken? Maybe the person who copied out the tag made a mistake? If the trailing single quote is missing, part of the clonal name is probably missing.
You can often look up hybrids in the Royal Horticultural Society orchid hybrids registry:
The International Orchid Register / RHS Gardening
You typically enter the hybrid genus and then the grex name.
The RHS constantly changes names to match the latest fads in taxonomy. Many orchid genus names have been changed a lot in the last decades.
In this case RHS shows no Epilaelia Westcon. It says the nearest match is a plant called Cattleychea Westconnet Gold. This is a hybrid of Prosthechea mariae x Cattleya milleri.
In times past the first parent has been called an Epidendrum, and the second has been called Laelia milleri. In fact, almost all orchid people still refer to it as Laelia milleri. So Prosthechea mariae x Cattleya milleri might, in the past, have been called Epidendrum mariae x Laelia milleri, or an Epilaelia.
This is conjecture on my part. But it is a possible explanation - if your label is incomplete. If your plant does represent Laelia purpurata x (Prosthechea mariae x Laelia milleri), it would be a very unusual hybrid, unlike most kinds of hybrids produced. It will be great to see photos of the flowers.
A good place to look up orchid species is the
Internet Orchid Species Photo Encyclopedia. You can find interesting information if you look up the possible three ancestors of your plant.