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1) BBC Micro (6502 Proc @ 2 Mhz)
2) Acorn Archimedes A3010 Arm 250 CPU (Yes it had an ARM chip running at a monstrous 12MHZ, was a RISC chip too)
3) Gateway 2000 (!) P5-90 with Socket 5 motherboard (no L2 cache etc)

First PC! Eventually phased out with 200Mhz Overdrive Chip and a few memory upgrades.
4) PII 266 64MB Ram...
5) P4 1.8GHz 512MB Ram...
6) P4 3.4 Ghz... 1Gb Ram
7) Current system QX6850 @ 3.0 Ghz.
8) Cell Microprocessor + 3.2 Ghz (PS 3


)
School
1) Various BBC Micro (6502) / Acorn Archimedes computers that the school had at the time
(Arm chips a plenty!)
2) 386 sx/dx
3) 486 - various flavours
4) Pentium 200
University
1) Pentium 2 300/333/400/450 etc up to P3 933 Mhz
2) Pentium 4 1.8 - 2.0 ghz - strangely they never had anything faster than 2.0Ghz for the students to use.
Macs
Brother has a heavily upgraded SE/30... couldnt tell you what the exact spec is but is definately not standard.
Various Macintosh from ii/iix all the way up to Powermac G5 (school/uni etc)
Loans have included:
Sinclair Zx Spectrum
Commodore 64
Acorn Electron