There have never been any operational 427s in the UK, only demos (and perhaps one, max two of those only!). As for 407s the current fleet is one in UK, four in Eire and this is the full fleet list including foreign reg ones.....
407s in UK
==========
53186 G-GAJW based Cambridgeshire, private op
53208 G-EJTT sold to US
53375 G-IORB sold to US (was prev op as N407RB by same owner)
407s in Eire
==========
53137 G-DCDB based Knocksedan, private op, occasional charter via Eurojet (was previously op as C-GCDB and orig N7238A with same owner)
53282 EI-STR
53331 EI-DBN bought 2003
53551 EI-GAN bought 2003